For me it only does it with Hornady Critical Defense, haven't tried many different brands. The Federal Hydra Shok, HST, Champion brass FMJ, Champion aluminum FMJ and Perfecta brass FMJ worked as it should.
If I load the magazine with 7 Hornady CD and insert magazine rack the slide to load the chamber then drop magazine the top bullet in magazine then falls out. Reinsert magazine repeat again and the top bullet would drop but after that it would stop stripping a round out of magazine and function normally when manually racking slide to empty magazine.
So two things I have noticed for me, only happens with Hornady CD and only happens when magazine is full or near full capacity. I don't know if Hornady rounds are slightly thicker in circumference creating more pressure on mag spring when fully loaded or if the flex tip design has something to do with it.
I will just use a different self defense round and after a couple more range trips using FMJ ammo and it gets broken in more I will see if it somehow fixed itself