Its a metallic material (pbr).
Why is this happening? Those… things…lines or whatever…
See attached screenshot:
Banding. Try to use high precision normals/tangents at static mesh settings.
Thx for the help. I tryied that and was not working.
Finally i got it; it was a Toon shading postprocess i had on. Just deactivated it and weirdness is gone 
Anyway, thank you for taking the time to help me!!!