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Hello, I'll admit I'm not familiar with how Linux works in general, so I don't have any answers for you about that.

This is my first time hearing about that kind of keyboard bug, and I can only say try out a controller for now. I just recently added controller support and the game can switch between Keyboard/Controller support at will, which might have caused some things to bug out.

Another thing you can do is try loading the default keybinds and saving them, maybe somehow, something got messed up.

If you do have controllers but still prefer the keyboard, try unplugging the controller. Maybe the game's deadzones might be messed up, causing strange inputs