I attached the system information about this because I am wondering if we just have an actuator issue. The way it is supposed to work is then larger temp control will set the temperature. Then when you turn on the dual button and move the temperature up and down, it will adjust the passenger side from what the driver side is set too. Meaning it will not allow you to set it to a different temperature from side to side. It allows you to set one temperature and then you can pull that hotter or colder. Notice in the second attachment it says it will not show passenger temperature only driver side and when you adjust the passenger control it will adjust it relative to the driver temperature.
Maybe adjust the temperature and let it set for a little bit to see if you can notice a difference if you haven't done that already. Point is, I am not sure if you expected to see the temperature numbers change because that would be logical.
Images (Click to enlarge)
Saturday, October 5th, 2019 AT 8:03 PM