Dangle, Gravity or Stiffness changes during render through Media Encoder

I am a novice at best with Character Animator and am having issues with rendering out a scene that loses its gravity or stiffness during the render. The scene is of a bio-mechanical brain with three antennas on its head. The antennas sway back and forth as the character's head sways. The probelem is that It will render about 20-30 seconds correctly (the timing varies) and then will 'lose' the stiffness of the antennas unexpectedly for the remaining 7 minutes of the scene. I have attached screenshots of the character as it appears in CHanimator's review window and the final render after going through Media Encoder. I am exporiting using the 'video alpha with Adobe Media Encoder' drop down as I need it as an alpha channel to import into AE for compositing. If you watch the QT I have attached, you will see where - not only the antennas, but also the shape of the head and the dangling moss from his ears - changes as well. I don't have any keyframes at that point in the timeline either.