Yes, it is a "problem" in PrusaSlicer until 2.5. They compare the name to be Repetier-Server. They know about it and PrusaSlicer 2.6 should have a fixed solution. I already got a test version with bug fix that seemed to fix this issue.
So only solution until then would be to comment the oem branding name in the RepetierServer.xml file where it gets set, then slicer will accept it.