Need help with Volumetric Clouds appearing "blocky"

Hey there, some time ago I think I changed something in the volumetric clouds texture and my clouds are now appearing to be very “blocky” as you can see in the picture.

I can’t find out what to change to get them to look normal again, I have compared every texture and material from this project with a new one where the clouds look normal but I can’t find any difference.

Does somebody have an idea or hint on where to look or what could make the clouds appear that way ?
I’m using Unreal 5.3

Thanks,
that Fain