Why does my game looks like grainy and sharp borders (basically it looks strange)

https://reddit.com/link/1ped0v7/video/qvmhcywmd95g1/player

I have an rtx 4070, an i7 11700F and the graphic settings are in ultra, this is my monitor

https://ibericavip.com/monitores/monitor-pcvip-vipm27f200-27-led-fullhd-200hz-g-sync-compatible-curva