Hi,
I dunno what's happening with the puppet tool but what I'm sure is it gives my a hard time 
..I placed a video so you can clearly see what the problem is - it's on the head tail of my characters just in case you're looking for it.
Everything seems fine at first ( by the way, the character is in PSD. I also tried PNG). But when I'm using the puppet tool (00:15) to animate the character, a slice comes out of the head tail (00:37). It goes like that when I preview it.
Please help! Thanks a lot.
PS: I'm bad at english, hope you understand what I wrote :3