Figured it out. I was running the game on unlimited Max FPS and I guess the game doesn't like that. So I capped my FPS at 60 and now I'm good, every issue I described is gone. Makes no sense why this is the fix though.

MonkeyManTD
@MonkeyManTD
Posts
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Odd Movement Issue in Zombies Mode -
Odd Movement Issue in Zombies Modeyo, i am having the same issue, I played this game religiously like a year ago but nothing like this happened, also when i move i notice my character has a diagonal path a lot of the time when I'm just pressing forward (don't know if this happening with you, would like to know if it is). Anyways I'm still trying to figure out what is happening.