Weird 'Shadow'

Hi everyone, I’m new here!

Enscape expirence for 1year 2months.

:sketchup: Using Skertchup for enscape. Does anyone know what is the problem and how to fix it. Thank you!

I checked all Visual setting still can’t find the cause.

The Steel Transition of floor are separate with the floor.

And the thickness of the Steel Transition is 1mm stick with the floor.

Maybe there are too many light around???