Can't stack servos

[Resetti's Replicas]

I'm trying to make a Wowot replica, and it has four servos all on the same chain; the shoulder joint, the elbow joint, and the pair of jaws.  The shoulder and elbow work fine until I attach the servos for the jaws; the then jaws work but the shoulder and elbow don't.  Is there some way of fixing this?
 
Thanks in advance.

[Naryar]

Four servos in a chain of components ? Really ? It'll probably rape your bot to death with agod.

You can try installing it with pause on, but it is no safety against further glitching when you remove pause.

[Resetti's Replicas]

Hmm, so it looks like the two motors furthest from the base are the only ones that work, so I guess I could just make the jaws stationary.