I've noticed a similar issue. I merely used cloner, transformed it to an editable object, and then made UV. The same/similar issue occurred. Take a look at the pictures. The first is with basic C4D material. This is somewhat bothersome because I need to submit the proposal very soon.
I HAVE noticed a bit later, that it was caused by the normal map with LINEAR gama. When I uase a normal map with gama 2.2 the problem was gone. ARE WE SUPPOSED TO USE GAMA 1 FOR A NORMAL MAP?