When going fullscreen in csgo (may be the same with other games, unknown.) the non primary monitor which has its color settings set to limited swaps to full color range, and resets to limited color once you leave fullscreen. This behaviour is even observable when going into activities overview.
It would appear that the issue is caused by csgo and its gamma management affecting ALL monitors, not just the game itself. Closing since this is not a bug but a very.... Improper feature.
When going fullscreen in csgo (may be the same with other games, unknown.) the non primary monitor which has its color settings set to limited swaps to full color range, and resets to limited color once you leave fullscreen. This behaviour is even observable when going into activities overview.