Need gmod help

[UHC]

My gmod has been acting very strange lately and I have no idea whats causing this. Whenever I load a map in singleplayer or join a multiplayer game, the main menu buttons stop working. I have to exit the game for them to work again. But even more bizarre, is when I try to use chat, or type in console, any time I press the "A" key, the message gets deleted and gets replaced with the "A" I typed.

So if tried typing in "hey gang", it would instead be "ang"

Idk what's making this happen. I've tried verifying the game, uninstalling addons that updated recently in case they had some scummy stuff put in and even changed the the game's download location, but this issue keeps happening.