Problems with UV-Projection

Hi,

I have a problem with importing meshes of different Types in Substance painter. I added a screenshot to show what I mean. Even with simple objects from Blender or Zbrush (ring, plane) I get these stretched artifacts in painter. I have not found informations about this problem yet. Does anyone know what I am doing wrong ? I doesn't occur with simple a cube or the icosphere of blender.

The thing is that other programs like Vue have no Issues with the created UVs in my objects. It occurs just in painter.