[PC] Custom & default keybinds randomly overlap and/or don't work

Has anyone else had issues with custom keybinds overlapping with the key's default keybind? Specifically i've remapped C to be crouch(toggle)/prone(hold) but it will randomly stop functioning as such and attempt to double-activate crouch when I short-press it (thus making me stand when I want to prone/crouch, getting me killed). This has happened to LCTRL, Z, and C which are all keys I have remapped to other functions.

I have also had tanks not respond to WASD for throttle and steering, which are default, it just inches forward because LSHIFT still works as a boost.

I didn't experience this at all during any of the open beta weekends, and it's been frustrating. Anyone got a fix?