Well there is basically 3 objects in the scene.

A half polygonal sphere with a lambert shader with the HDR file mapped to the color and ambience.

The balls themselves with a blinn shader with a blue color and a few tweaks to the reflectivity, eccentricity and a few other of them values.

And the floor plane which is just a lambert shader with a light gray color. All rest of that shaders settings are left at default.

Also on the half sphere I have turned off the first 4 or so options within render stats. I'll try the same with the floor plane and see if it will fix it. Thanks.


Edit: Ok I tried unchecking some of those options in render stats for the plane, but it never fixed it.