For some reason, my 4inch xd9 magazine sometimes only loads 14 rounds. It is a 15 round magazine, but seems to stagger incorrectly sometimes when i load it. Only one of the magazines do this, as the other one I received with it works perfectly fine. Is there anyway I can fix this problem? Or am I loading the bullets in an incorrect way (if there is a correct and incorrect way to load a magazine)? Any feedback would be appreciated.