Arcade stick on PC issues

I have an arcade stick I use on my PC, it’s just a wired PS4 controller I soldered to use as the PCB. Anyway, it’s worked fine for some months now but out of nowhere whenever I press the start button(wired to the PS button) it’ll do some other undesired effect. For instance when this problem first started it would turn the volume up, but now it opens steam big picture which you could imagine is a lot more inconvient while playing. My question is, has anyone here experienced something similar? Are there any solutions I should try? Restarting doesn’t help. I’m desperate at this point I can find anything to help.

Try turning off the steam controller overlay

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