this is a tad weirder than the Resetti thing. But the Resetti thing WAS a glitch. This one might be a glitch too. Is this game used? Some guy could've hacked it and then tried to fix it, leaving the glitches.
It is a little weird I guess, but brush it off. If it was only once, then ignore it. Maybe the memory card screwed up. Nothing to really worry about though.
Thats... really weird. I think it's happened to me a few times in ACWW, but that was when I was using an AR. It's a little weird I've never heard of that happening in PG.
Check the memory card. It could be corrupt or something.