Layer warping and distortion?

Hey guys, sorry but I have another question,

I am having an issue where some of my layers are distorting / warping after animating new frames. The old frames, which appeared fine before I continued with the animation, are now very… jumbled, and the flame I am animating doesn’t look very much like a flame in a lot of the frames…

If you have any idea of what may be going on, and how I can stop it, please let me know. All help is very much appreciated!!

It is not enough information and data to give you a proper reply.
Please attach the offending file and spot where the problem appear.