In the inspector, my view looks like this: 
Although in reality (view from the installed application) here is this: 
That is, in the inspector of the view it seems as if pressed inside, strange shadows, contours.
How can this be fixed? Who faced this? And is it the norm?
What has already been done to correct:
1. Changed AppTheme
2. Peretykal already all the properties of the buttons here: 