I had the same problem with one of my mags as well. Was difficult to remove as well. Almost needed three hands. I solved the problem by selling it.
Auggie D.
I had an SKS D years ago and found it very finnicky and a complete pain in the ass. I ended up selling it for way more than I paid for it and bought a CZ-858. Problem solved. I don't understand why there is such a demand for these rifles.