SELL -1 SPY STP 434.90 [TO CLOSE] 9/28/21 09.59.08
Don't know what you are talking about. I clearly said that I was stopped out at 09.59.08 central.
But at that time, my chart was showing 09.55am price which was 435.24. Looks like market data was interrupted between 9.55am and 10.45am.
I posted a chart showing when your stop was hit. But enough of this. Good luck.