FPV servo acting weird

When we test the servos on the gimbal that controls the fpv/thermal camera, the whole gimbal jerks to the upper left position and goes upside down when we move the joystick not even an inch. We have the servos plugged into the PCC, but it just does this, even when we try and switch the positions of the servo wires.

This is likely due to the gimbal not being calibrated.
This video is shown in the documentation and is a bit hidden in the Gimbal Assembly section when IMO should be in the Gimbal Testing section.