So I’ve been working on this all morning and even called Blizzard Technical Support.
I was playing Windowed mode and the problem went away when we went into full game mode. So that meant the problem was only with the mouse.
I reinstalled the driver to my mouse. Using a SteelSeries WoW Cataclysm MMO mouse. That fixed the problem. I went back into Windowed mode (my preference) and everything was good. No more crazy mouse.