Truth, Lies and In Between

Anyone out there have any experience with a Yugoslavian SKS magazine not feeding the last round?
It doesn’t matter if I load two rounds, or 1o, the last round won’t chamber. The bolt locks back as if there were no round sitting there. If I release the bolt, the round chambers. Almost seems like it isn’t pushing up far enough into the path of the bolt.
If so, please comment on how you fixed it.

Thanks.