Parallax Occlusion Mapping strange artifacts

Hello,
I’m new to UE and setting up my first test level.
Blocked out a small map and started to play around with the shader system.
Now I got a strange problem with the POM. On sharp angles transparent artifacts appear. (View screenshot)
They always appear on the same distance to the camera and close to corners.
Hope someone can help me with this, couldn’t find any solution to this problem.
I also added pictures of the node tree.

Screenshots:

Thanks in regards.