Check the normal display sequence and selected screen before deciding that one compartment is switched off. Some interfaces show one value at a time.
What the observation tells you
A blank or damaged portion of the display is another possibility, and the actual storage conditions remain important. Random button presses can change a target while trying to reveal it. Do not use the appearance of the screen as the sole performance test.
A useful next step
Follow the model's interface instructions, record any persistent missing indication and check both spaces appropriately. Protect food while an unexplained restart condition is assessed.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.