Something wrong with shadow side

[mindaugaskaranevskis]

Hello,

I'm rendering interior scene and I have a problem. As you can see in my image there are two chairds, one the left side the chair is normal, and on the right side something is wrong. It looks like that the bump is too strong, but the material is the same on both chairs. I also tried to change material to pale white, without any bump, but the effect is the same, also I tried to change to other model of chair, but also the problem is the same. I think that is something wrong with shadows configuration, becouse all chairs on that positon renders with same problem. Can you help me to fix it?