Hmm, it's probably your import settings in the software you're using for the eating animation. I just downloaded the asset pack to make sure, and both spritesheet and gif for the eating animation seems fine. What software are you using the spritesheet or gif in?
Hey, by the way, check my game out, it uses them. I reached out via Twitter, but it seems u never read my message. I was wondering if you wanted a link to your Twitter or anything.