Games change my screen brightness

[aspiksssssss100202]

Hello,
Lately, I've re-installed my Windows 10 on new SSD, after that, I started experiencing this weird thing when games change my screen brightness to be much darker than before.
For an example, everytime I launch For Honor, my screen brightness turns much more darker than it should be.
I can fix this by:
Restarting PC
Disabling and enabling my GPU (GTX 1070 Ti) in Device Manager
Re-installing GPU driver

But I'm looking for a long term fix, and of course, I have to play games in much darker brightness.

 

[ElectrO_90]

Are you sure the in game settings are changing it?

 

[drivinfast247]

Adjust the brightness using the games settings.

 

[aspiksssssss100202]

The problem is, that the brightness stays dark even when I close the game.

 

[aspiksssssss100202]

Actually, it screws up brightness in more colours, it doesn't just get dark.
Chrome is much brighter than it should be, but Steam is much darker than usually.

 

[aspiksssssss100202]

Seems like I found the solution myself, it was because of my monitor.