Trouble with no animation Java models for mobs

I'm having a bit of trouble with a boss mob that I'm working on. Here's a screenshot of how it looks when running a client test:

You can probably tell that this is not at all how that's supposed to look. Here's what that same model looks like in Techne:

I'm not sure whats happening with the model that causes this to happen. I also have everything on the model set to No Animation in MCreator, so I shouldn't have this problem in the irst place. Can anyone help me out? Any support would be really appreciated.