Problems with shadows in the viewport ¡HELP PLEASE!

Hi! I have a problem with lighting or shadows or ambient occlusion or something else, I don’t know. When I move the camera aside, the shadows disappear.

I link you a video to see it better: https://drive.google.com/open?id=15mT0O5mUhNckwE0nJF6cvd6Aq058m-X8

I also share you a folder with images of some parameters:

Sorry for my english. And Thanks to You!