Custom Model Animation Issues?

I'm trying to create an animation for a custom model. I've been using a character plugin to create the binding which then lets me animate my model. I'll begin to animate and move parts around so they'll animate the way I'd like them to. However, when I press play to see the result, the ENTIRE model just moves in the general motion I created for just a few particular parts. Everything just appears to be sticking together. Is there something wrong with the animation plugin? Or is there something wrong with the binding? Help would be greatly appreciated!