Mob Model has Extra Parts

I'm trying to make a mod with custom mob models, but the one I made and will use as a base for many more has extra flat parts from the texture that shouldn't be there. How do I get rid of them

Here is a screenshot of the model in game: https://drive.google.com/file/d/1ZucB7fhy9HKvqfqyvA6YtRNQn_ITIgt7/view?usp=sharing