Mouth Envelope Deformer not saving changes

Hello guys,

My character has deformers on his arms and mouth. When I insert the keyframes and make changes in order to animate, the curve deformers for the arms save all of the actions, so when I apply Set Motion Keyframe, the deformers move the arms and so.

But when I try with the envelope deformer on the mouth, it doesn’t save any changes, but changes the mouth in all of the frames, even when I press Alt+Shift+D. I don’t know what to do about this, as I can’t lip sync the character if the deformer is going to apply the changes for all of the frames…

Anything I can do here? Help is highly appreciated.