It's quite possible that someone has messed about with the rifle Waidmannsheil.
The trigger is not like any other MSch I ever came across, lots of creep, so pretty poor.
I have stripped it right down to have a look & there's a definite 'sloping ridge' right where the sear should release the (bolt) firing pin.
It certainly needs sorting out, but & it's a big but, it means taking metal off! So needs very careful attention.

I will make this rifle good to hunt with though, so it's not going to be a rush job.
Cheers, d