Nostalrius Begins - Quality wow vanilla realm (1.12)

Hey, I have been having a really annoying bug where my character will randomly get stuck running in place, or essentially doing the last thing that I was doing continuously. If I am running forward and then take hands off everything I keep running in place, same going backwards, or once I finish casting something my body stays in the casting position. Nothing I do fixes it and usually just have to wait about an hour or so for it to stop. I do not see others doing it so do not think its lag. I think I remember this being a bug for me in vanilla, but no one seems to have the same issue at all.

If I could please get some insight or help into this, then I would be so grateful!