ending of song goes wrong

Hi all.
I'm new at this, so maybe anyone is familar with this issue and knows what to do.

I got "Celin Dion - My heart will go on" song file sample (from seller), marked and punched wholes (i got 30 notes Wingostore music box). Then played couple times - it sounded perfect.
However, later when I tried to play one more time, begining was ok, but ending was like from horror movie.
I analysed and find out, that paper strip moved a bit (1-2 mm) to one side (and wholes as well), so that was the reason.
Paper strip side isn't damaged (at least i dont see).

Any suggestion, what to do?