Hi,
There is only one motor that controls the backrest. So, if one side is moving, there is an issue with the frame.
First, make sure the seatback is tight. There are four bolts that hold it to the bottom frame. If one side is loose, chances are it has allowed the actuator rod to become disconnected from the right side.
If you look at the pics below, they show the bolts to check and the motor/actuator rod to check and make sure it is fully in position to move to the right side.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
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Wednesday, December 22nd, 2021 AT 9:00 PM