The Brightness/Contrast gradually increases when ADS. This happens specifically on Contaminated (for me at least) and when using the M136 AT and recently discovered on the SM Rifle Variable sniper scope on the Mini Scout.

Apparently the main culprit that was causing the brightness issue is having XESS Native AA on. To add more, setting FSR (FSR 4.1) as anti-aliasing causes stutters/FPS drops on the spawn selection screen.