BlendShapes Animations wont finish.

Hello everybody and thanks in advance.

So, I have a Head setup for facial animation. It has been made in Max with a mixture of bones and Blend Shapes (bones for code driven head and eyes movement)the rest, phonemes and emotions made trough Max Morphs (aka BlendShapes). I'm exporting in fbx format.

The Problem is that my animations seem to get stuck in the middle of and not playing from start to end. Or maybe the animations are playing but the blendshapes are the ones getting stuck. I realized this looking at the skinnedmesh renderer in run time. As the character starts talking all the blendshapes start to go up and down from 0 to 100 as expected. The problem is that instead of going back to 0 after reaching 100 as the animation curve does. They get stuck in random points in between 0 and 100.

I would appreciate any help from you. I tried forums, google and everything, you´+re m,y last hope guys... :)

If I'm missing something or you need more info. Just tell me please.