You copied a leader, and your entry sits worse than theirs — or the trade never opened at all. The exchanges document exactly why, and none of the reasons are deceit. Knowing the mechanism tells you which part of the gap is yours to set.

What are you actually looking at?

Two screens, same trade. The leader's position shows an entry at one price. Yours shows a worse one — a few basis points on a quiet day, a visible chunk on a fast one. Sometimes there is no second screen at all: the leader has a position open and your account does not, with no error message you were shown at the time.

The first instinct is that something dishonest happened. Usually it did not. Every one of these outcomes is written down in the exchanges' own documentation, because copying is not mirroring. Your account is not a reflection of the leader's; it is a separate account that receives an instruction after the fact and executes it against the same book everyone else is trading. What follows is the mechanism, and then the part of it you actually set yourself.

What happens between their click and your fill?

Copying is sequential, not simultaneous. Bybit describes its system as "replicating the Master Trader's order parameters to the Followers' accounts, one order at a time, after the Master Trader places them" (Understanding Discrepancies Between Master Traders and Followers' Position, Bybit Help Center, as of August 2026). The leader's order goes to the book first. Then yours does, along with every other follower's, in some order that is not yours to choose.

What your order is depends on the venue, and the difference matters. Bybit is explicit that "the entry and exit of trades in Follower's Copy Trading Account are filled using market orders, which are subject to slippage," and that "the final executed price may vary from Master Trader's due to market volume and conditions" (same page, as of August 2026). A market order does not ask for a price. It takes whatever the book is offering at the moment it lands, and the moment it lands is after the leader's own order has already consumed some of that book.

Binance splits it by side. Its copy trading rules describe copying a lead trader's taker entry with an IOC limit order whose limit price is set at the slippage cap, while a close — whether the lead trader used a taker or a maker order — is sent as a market order for the copier (Binance Copy Trading Rules, Binance Support, as of August 2026). Immediate-or-cancel means exactly what it says: the part that can fill at your cap fills, and the rest is cancelled rather than chased.

So the gap in your entry price is the sum of two ordinary things: a delay while the instruction is replicated and routed, and a book that has already moved — partly because the leader just traded in it, partly because you and the other followers are now trading in it too.

Why did the trade not copy at all?

Because a guard stopped it, and the guard is doing its job. Every major venue caps how far your fill may drift from the leader's before it refuses to open the position on your behalf. The thresholds differ, and they are not a standard.

On Bybit, "the system implements a default maximum slippage allowance of 0.1% per order, which can be adjusted by users up to a maximum of 5%" (Bybit Help Center, as of August 2026). On OKX, "if there's more than a 0.5% disparity between the lead trader's and your entry price, our slippage protection mechanism will cancel the copy trade" (What could be the reasons behind the failures of my futures copy trades?, OKX, as of August 2026). On Binance futures copy trading, "the default slippage protection for BTCUSDT and ETHUSDT is 0.5%, and 1.5% for other trading pairs," adjustable in your copy settings — with the pointed footnote that "slippage protection will not be applied to closing the position" (Frequently Asked Questions on Binance Futures Copy Trading, Binance Support, as of August 2026).

Read that last clause twice. A guard on the way in and no guard on the way out is a deliberate design: refusing to close a position because the price moved would leave you holding risk you asked to be rid of. The protection you set is therefore asymmetric by construction, and exits are where a fast market hurts most.

Slippage is only one of the listed refusal reasons. Binance's futures copy trading FAQ names six: insufficient margin balance, a lead trader's limit or stop-limit order that has not been fully filled, slippage beyond the cap, a position notional below the symbol's minimum, leverage that does not line up, and the maximum position limit being reached (as of August 2026). OKX adds caps of its own — a lead trader may open a maximum of 500 futures lead trade orders per day, and once the combined positions of a lead trader and their copiers reach the maximum position limit for a contract and direction, copiers stop opening (as of August 2026). Binance's rules also cap the copied amount at 80% of available market depth, so that the copying crowd does not run the book over itself.

None of that is visible on a performance page. It shows up in your account as a trade that simply is not there.

Why is your size not their size?

Because you set it, not them. Copy platforms give you a sizing rule and then apply it mechanically. Binance offers a Fixed Amount mode, which "uses a fixed amount per trade," and a Fixed Ratio mode, where you "set a total portfolio investment amount, and the system will copy trade proportionally" (Binance Support, as of August 2026). Bybit's Classic copy trading splits the same idea into a Smart Copy mode, which computes "a fixed ratio based on the Follower's and Master Trader's available balance," and an Advanced mode where followers "set the fixed margin for each copy trade on their own" (FAQ — Copy Trading Classic, Bybit Help Center, as of August 2026).

Neither is mirroring. A fixed amount means a trade the leader risked a tenth of their book on and a trade they risked one per cent on arrive in your account at the same size. A ratio means your exposure tracks a balance that changes underneath you. Two accounts following the same leader with different modes will produce different results from identical instructions, before a single tick of slippage.

Two consequences are worth holding on to. First, minimums bite the small account hardest: Bybit notes that an order will not be placed at all when the follower's available balance cannot meet the minimum order size requirement, and that a follower can be unfollowed automatically after failing to copy "20 times consecutively" for insufficient order cost (as of August 2026). A small allocation does not copy a smaller version of the strategy — it copies a subset of it, selected by which trades happened to clear the minimum. Second, when a leader scales into a position across several orders, each of your legs is priced independently and then combined; Bybit settles on "the average entry price derived from these combined orders," so the discrepancy accumulates across the legs rather than appearing once (as of August 2026).

This is also where the cost stack lands on top of the price gap. Every copied leg is a real order paying a real fee, which is the subject of copy-trading fees: the three layers between the leader's return and yours, and the arithmetic of what a fixed cost does to a small target is worked through in what fees and slippage do to a 2% target.

Whose return is on the leader's page?

Theirs. Bybit states the calculation plainly: Master ROI is "Total Profit / (Previous Account Equity + New Deposit)", measured on the Master Trader's account, and it distinguishes that figure from a follower's outcome because "Followers' entry timing/prices may vary" (How to Understand a Master Trader's Performance, Bybit Help Center, as of August 2026). The same page carries the exchange's own warning that "past performance of Master Traders is not a guarantee of future returns."

That warning is not just legal furniture. It is a statement about what the number is. The published curve is computed on one specific set of fills, one specific balance, one specific set of deposits — none of which are yours. Your series is a different series by construction: not noise around the leader's number but a separate measurement that happens to be correlated with it. It runs in the same direction, not at the same magnitude.

Regulators have started to press on exactly this. ESMA's supervisory briefing on copy trading, published in March 2023, sets out expectations that firms give clear information on past and projected performance and on the method used to calculate and present it (ESMA provides guidance for supervision of copy trading services). The direction of travel is that a headline percentage without its method is not information.

The gap between a published curve and an inherited one has a second half, too: you also join whatever position is already open. That part is covered in the drawdown you inherit when you copy-trade.

Where does the gap get widest?

Predictably, and for reasons you can see before you allocate.

Thin books. A pair with little resting size moves further per unit of order flow, so the same delay costs more. The venue-level depth caps exist because a crowd copying into a shallow market becomes its own counterparty.

Fast entries. A leader who enters on a break, at a news print, or into a liquidation cascade is trading in the seconds when the book is widest and thinnest. That is also the moment your slippage guard is most likely to cancel — meaning that on the sharpest moves you are most likely to either fill badly or not fill at all. Both outcomes are a divergence from the published record.

Scaling in. Every extra leg is another independent fill, another chance to be refused, and another entry averaged into your position at a price the leader never paid.

Exits, on any venue where the guard does not apply to closes. The leader's exit is one price. Yours is whatever the book gives after theirs, with no cap standing behind it.

What is actually in your hands?

Four things, and none of them involve predicting anything.

The slippage setting, understood as a trade-off rather than a dial to maximise. A tight cap means fewer bad fills and more trades that never open — which itself makes your record diverge from the leader's, just in the other direction. A loose cap means you copy nearly everything, at whatever price the moment offers. There is no setting that gives you both, and the venue default is a default, not a recommendation for your account.

Your sizing mode, chosen deliberately. Fixed amount and proportional are different products wearing the same button. Knowing which one you are on tells you in advance whether a leader's biggest conviction trade arrives in your account as their biggest trade or as an average one.

The minimum-order floor relative to your allocation. If your allocation sits close to the point where orders fail to meet the minimum, you are not copying the strategy. You are copying the trades that happened to be large enough, and no performance page will ever describe that subset.

How you read the published number. Treat it as a measurement of someone else's account, taken with a method the venue defines. It is evidence about a leader; it is not a forecast about your balance. If the comparison is going to mean anything, the only series that describes your account is the one your account produces — which is the argument for logging your own fills next to the leader's and judging them as two records, not one record with a lag.

If you are still deciding between handing over execution entirely and taking the entries yourself, the trade-off in what stays under your control is laid out in copy trading vs signals: which decisions stay yours.

The short version

Your fill is different because your order is a different order: sent later, into a book the leader has already touched, sized by your rule, and gated by a cap you chose or inherited from a default. That is execution, and the venues document all of it. What it is not is a reason to expect your account to trace the curve on the leader's page — that curve was measured somewhere else, on fills that were never available to you.