When I press Alt+Shift and Ctrl+Alt my screen changes contrast/. Ctrl+Alt sets it to "Default" while Alt+Shift cycles between "Normal", "Light", "Contrast", "Bright", "Vivid", "Intense", "Dimmed", and "Opaque". I have no idea what caused these hotkeys to start behaving this way, it's been this way for as long as I can remember. I just can't stand the behavior any longer and want to make it stop. Any ideas?
This issue was caused by a program called "Game Companion" which I had previously used to force games that didn't natively support borderless windowed mode into that display configuration. It was running at startup and had hotkeys for gamma adjustment.