Steam Games get wrong input with 8bitdo Ultimate

Hey there, I am using the "8BitDo Ultimate Controller with Charging Dock" and have been using it for quite a while without any problems. But since a few weeks I get a strange behaviour in steam games.

1) In steam big picture everything is working correctly.
2) Steam input is disabled
3) The behaviour I test this with: Binding of isaac treats the "a" button as "down" instead of "b" (labels are for nintendo, not xbox)

I have tried enabling and disabling steam input, resetting steam settings, switching proton versions, I honestly don't know what else to try.

lsusb output:
ID 2dc8:3106 8BitDo Ultimate Wireless Controller

Any ideas? It makes all controller games unplayable.
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