Sorry, let me clarify.
The December ES bid/ask was 1021/1021.50. My ask price was also 1021.50. The September ES bid/ask was 1025.5/1025.75, and September SP bid/ask was 1025.5/1025.8.
Then, my order was matched. Less than 0.1 seconds later, the December ES bid/ask was 1022/1022.25, the...