WEIRD Shadow

Hello everyone!

I reeeeeally need some help here!..

The best way that i can explain it is in the video below

Video 1:

Weird fact > Video2: When i use Mtl Override, with standard corona material, just removing the windows from overriding, the weird shadow is gone. I can remove the sphere of Override too and the shadow does NOT come back. When i put back the materials, the shadow is casted again… And it appears even more, if i low down the value of r.glossines from the floor…

Video 2:

Thanks! Reggards from Brazil!