Burned Corners & Distorted lighting colour

[hinchunlai]

Hello everyone, does anybody know why there are these burned corners? I know those spots are kind of dark, but I thought indirect lighting would be sufficient for those corners.

 

Another issue, the circled area also has a distorted color, purplish lighting which shouldn't be, any idea too?

 

 

I'm using Vray 3.4, and the scene is lit up by a hdri skydome, ies, and a sky portal at the shopfront on the left .

 

 

I have also included the camera and render settings below. Thank you!