These blendshapes are different in name but actually identical in function. I open the fbx file in maya shown as below. You can see that I hide all other blendshapes but show the two blendshapes of jawOpen and jawLeft, however, these two blendshapes are almost the same. I do not know if it is because I change the number of LODs to 1 when I export the fbx file (following the solution of **** ), but the blendshapes are reaaly different from the traditional blendshapes. I have used the live link face of iphone to test the facial animation, which seems it is ok, so I feel quite confused about the blendshape mesh, which seems really different, anyone can give a explanation ?