Alright I tested it a bit more. Basically everything works fine while I have either on of my accounts standing still. As soon as they are both moving, the screen that I am watching goes crazy. It doesn't matter if they are following eachother or just flying on a hypogryph.

I turned off all UI mods and turned off autohotkey. I still had the problem. I only have WOW installed once, and I am doing everything exactly like I was before when it worked just fine. So I really think it must be some setting that changed and I don't know where to go to change it back.

Any more help would be greatly appreciated.