USFIV - Pressing start in a match against CPU

When I am in a match against the CPU, if I press the start button on my stick it acts as if Player 2 pressed start to join in for a match. How do I get it to stop this? Player 2 has a start button assigned to the keyboard and my start button is on my stick which has a ps360+ pcb.

Edit: I forgot to add that I am playing USFIV on PC.

Edit #2: I found some time to sit down and troubleshoot. It looks like a driver didn’t uninstall fully, vjoy and that was causing double presses for player one and player two at the same time, resolved.