[PC-EPIC][0.76.01][Visuals]Sand textures are pixelated

Summary
The sand textures are pixelated , especially at night.

Seed
This issue is not depended on the current map.

Settings
Graphic settings set on ultra preset.

Some pictures :

I tried some other settings(like shadown : off , AA : off) but is still the same.
PC specs:
Cpu:i5-9600k
Gpu:asus strix gtx 1080 oc 8 gb
RAM:32 gb
OS: win10 home ( version : 20H2)