Three legs work perfectly fine, back right shoulder doesn't seem to move as much as it should. It seems to go to the zero position correctly but any other movement it's completely off. Is this an issue that adjusting the offset would resolve? Can someone point me to some instructions? Any forum posts and the setup don't seem to explain why to adjust it, and I'm completely new to servos.
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You're totally right, they were wired wrong. I think they were wired right when I initially had this problem, and I tried the spare servo and when I put the first servo back I plugged them in wrong. But anyway it's working now, thanks!
Check your wiring of the back left shoulder and knee servos. They seem to be swapped.