Hi all, Last week I had an overnight trade that I can't account for. I have no recollection of either entering or exiting it. Fortunately, it was a fairly profitable trade even, but in this environment, it could easily have ended up with a margin call. Looking over my records - my only explanation is that my exit on a certain long trade have been exceeded by an additional contract making me net short 1 contract overnight, i.e., long 5 contracts -> exit 6 contracts. Going over all my executions for said day as reported by my trading platform, the number of buys are matched by the number of sells and all trades have an equal entry/exit size. So, I should be flat by EOD before shutting down. My trading platform also clearly shows when I'm in a position and finally gives a warning before shutting down if I have open positions. No such thing happened. I'm also very careful each day to make sure I'm flat before closing down the shop. In fact, I flatten many times throughout the day to make sure there are no resting orders I've forgotten. Opening my charts and execution window would also show if I had an open position on any given day. My broker insists that I must have carried a position from some other day and that my platform isn't accurate with matching trades from different days/dates, hence why my platform is showing different data than my broker statement. Personally, I believe this must be a software issue and that an actual error have happened here with no fault of my own. Has anyone experienced or heard about something similar? Is an error like this even possible? I have 1000s of trades under my belt and this is a first for me, but it frightened me a bit as it could easily have ended badly and I'm not sure if I could have done anything about it then. Thanks in advance.