Animations not working with my model

Hi, I am trying to animate a blender model in unity but the model gets screwed when I try to rig it in unity(when i open the "muscles" tab), and then the animations dont work properly. The thing is that I don't know what am I doing wrong, I thought it was something related with the weightpainting, but when I try to move it in blender it works properly. Also I dont know if it is of any help, but I rigged the model in blender with rigfy. I have no idea how to solve this problem and any help is apreciated