I had this same problem. The follower, on the 13 round mags tips the the rear so it doesn't catch on the little tit up near the chamber if inserted empty. Take the mag out, lock the slide back, reinsert the mag, push down on the mag follower until it clicks below the tit. Problem solved. The scratch's are from the slide dragging on the follower because it's too high. The mags will function properly if loaded with ammo.
