Strange artifacts on surface

Hello :slight_smile:

I am quite new to Unreal and have a little problem.
After light baking I have some artifacts on my platings, which should not be there.

I guess the lightning bake bakes it onto the surface/texture, but it only does this one time.
The result is, that I have the same artifact on each object I duplicate, which makes it really anoying.

I marked some of the problem zones.

Hopefully you can help me.

Kind regards,
Toby :wink: