HVAC problem with temperature

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Mazda CX-5
Hello,
I've never encountered this issue before, and I haven't heard of it happening in our cars either. The temperature on the passenger side seems to act independently. I set the initial temperature and hit sync, but after lowering the temperature once the car is heated, I've noticed that the passenger side is reading differently from the driver's side. There were no other occupants in the vehicle, so I don't understand how the sync feature gets disabled. The passenger temperature adjusts itself to random settings, and there's nothing nearby that could be accidentally pressing the buttons. Has anyone else experienced this?
 
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