I had an issue with my ejector being bent on my POF-5. It was dragging on the bolt too. If the trigger group hasn’t been worn down like mine from the ejector issue you may be able to replace it with the newer updated HK ejector which has been recommended to me by several others.
It won’t help you since you’ve gotten your paperwork, but Fedarm has been great with my issue and is sending me a replacement. Look several posts down for my POF-5 ejector issue/question thread. I posted several pics of my ejector and how it rides in the bolt. I’d post a link but I’m not all that savvy with this stuff... Best of luck to you!