Every follower account has its own limits, set by its prop firm or broker — not by Signal Trade App. The common ones: a maximum number of contracts (usually by account size — a 50K account often allows fewer contracts than a 150K), daily loss and drawdown limits (after which the account may be locked or allowed to close only), and allowed products, trading hours or news rules. If a copied order would break a limit, the broker rejects it and that follower no longer matches its leader — you get a 'Copy failed' or 'Copy skipped' email. Check that follower in your broker right away: when an entry was rejected, a later copied close can leave the follower holding a position the leader does not have. To avoid it, copy between accounts of the same size, keep the leader's size within every follower's limit, or trade micros (e.g. MNQ instead of NQ).