[CLIENT] - Settings Lost upon Closing the Game

This has been happening for about a month now. Every time I re-enter the game, it arbitrarily does two things:

1.- Forgets a Keybinding to a Mouse Button 2.- Sets the game to Windonwed instead of borderless

Every single time I have to change the settings back and I don't know what's triggering it. I wish I could provide more info but I don't know what's happening. The game is just not saving my preferred settings. This has never happened before since 2012 that I've been playing.