Walls and objects in physical view

[marlem2000]

Hi, there! I hope everything's well. 

I'm getting a big doubt about walls and objects in general since long time ago. For example, walls look great in Standard view but, in physical one, sometimes they look like "burnt" or overexposed. It usually happens to one wall inside a room. 

I've been making many tries and I don't know if it's a problem of light or render. This happens to some objects too. Am I doing something wrong?

Many thanks in advance