Interface Size Changes

Hey Guys,

lately my Interface Size just changes between two sizes without me changing settings.
I always play on 1920x1080 Windowmode (Maximized). I have never touched the "UI Scale".
But it seems that my WoW automatically switches between two "UI Scale" sizes and i really dont know why.
Is there like a hidden hotkey i might accidently use? I didn't even open Video options till that Problem occured again.
Anyone can tell me how the UI Scale might change itself?
Dont wanna set up my Interface every 2 days :(

Cheers buYaKa

May be because of one of your addons.