I'd bet the little nub that actually contacts the rim of the round is busted off. Honestly a lot of folks don't like them because they think they impeded the chambering process. I don't know about all that. Anyway, it isn't hard to replace. You can get a really cheap punch set, and there is little change of scratching the finish since the pin is set in so far. Just tap the pin in (it doesn't even have to come all the way out) and pull the punch and check. Once you take out the LCI drop the new one in and holding a little pressure on the LCI tap the pin back in roughly centered on both side.