A button's stuffed

I got Deaths Gambit today through Epic Games' free thing, and I can't use the A button for anything

For some reason the A button on the Xbox one controller I'm using opens and closes the inventory menu when pressed in game, meaning I cannot use it to select things within the inventory menus, and I cannot jump, which is preventing me from getting anywhere.
It also doesn't seem like I can rebind the inventory button in controls. I could be missing something but idk.
I tried doing some quick googling and couldn't find anyone talking abt the issue I was having, so I'm wondering if anyone knows how to fix this