What rendering program are you using?
So this is a Vray question. You really should add that information when you make the post in the first place.
The Vray experts will be along but the first thing I’d look at is the material properties for the material on the cabinet.
what about the materials
The mottled lighting isn’t just on the cabinet. It’s covering the entire room. Not sure what’s causing it, though. It could be a modifier on your lighting, or refraction from the glass chandelier. I’m not a Vray expert, though.