Game is changing contrast while character moving on ultrawide

Hi.
Today i changed my main screen (acer 27" 1440p 240hz) to ultrawide AOC U34G3XM and game started to changing contrast all the time while i am moving. On my second screen which is 16:9 that doesnt happend. Other games are not affected by this.

https://streamable.com/8hyytx

I tried :
Reinstalling drivers
turning on/off gsync
changing options on monitor itself to different profiles (there is no dynamic contrast or simmilar)
changing Displayport cable
verifying files on steam
changing resolution, dynamic culling, dynamic resolution, vsync
DLSS on/off, different modes
uninstalling gigabyte control center

i5 13600kf
gigabyte z690 gaming X
hyperx fury 32gb ddr4 3600mhz ram
msi rtx3080 gaming x 10gb
windows 11 24H2 26100.2454

nvidia 566.36 game ready drivers

I have same problem, dont know how to fix

I turned off G-sync, and now screen color doesn't change while moving