Raytraced Shadows problem

Hello!

I have a problem as you can see in the attached gif
Unreal_raytracedShadow

When I enable the ray traced shadows option, some white glitch grain appears instead of the usual shadow.
I have tried many different options so far but no results
Raytraced refl, transluancy etc working fine

My graphic card is rx 6800 xt maybe thats the problem?

Thanks in advance