Start point is a normal resolution(1920x1080), I start CS:GO and my resolution changes like it should to 4:3 streched 1280x1024.
As soon as I tab out of the game or exit the game the resolution wont change back to my normal resolution which results in my screen beeing half visible to me.
After restarting the computer everything is fine again.
These are my settings on my primary monitor: Monitor_Setting.png
These are my settings in the game profile of csgo: CSGO_Settings_AMD.png