(picture inc) I think there is a bug with my meshes and the shadow around it

the image displays my problem, i did´t know how to better ask the question. After building lighting i get these wierd shadow lines.

I´ve tried changing the lightmass res without success. Any help would be extremely appreciated.


If you mean the shading differences between your modular pieces:
Under lightmass settings:
Level scale 0.1
and smoothness: 0.6
will solve this problem!