This is a really weird problem.

I cannot attack any enemies while holding down W. Like, the mouse button just doesn't work. A, S, & D work fine, as well as simply standing still. If I auto-walk with Q, it also works. This problem does not persist in my other characters, which really confuses me as to why it only occurs in one character. It isn't a mod problem because I turned off all my mods and it still happens. If anybody could help me, that would be really great. Thanks.