Hello! I'm using mesh clipper in vray next and I have a problem, please see attached image with red boxes. As you can see, there's this weird white cut that happens at certain doors and windows. I think I modeled these doors and windows to work on the mesh clipper correctly. This doesn't happen on the other doors and windows. Does anyone know why this occurs? Thank you.

..I was just doing trial and error with the smoothing in the groups. Anyone can help me identify what/how exactly the smoothing should be done on this? Thank you!
. It has been 3 days of trying to find answers and today I decided to post here hoping someone could enlighten me. Thank you in advance!