The display may show the selected target, a measured value or a temporary control screen. Read the model's display explanation before deciding that a delayed change means the button has failed.
What the observation tells you
The cabinet itself cannot instantly reach a new condition when a button is pressed. Some interfaces briefly show the new selection and then return to another screen. A button tone only confirms an interaction, not that the food has reached a safe temperature. Repeated presses can accidentally select a stronger mode or cycle back through the available settings.
A useful next step
Confirm the chosen setting once, leave the controls alone and allow the response described by the manual. Use an independent suitable thermometer if the storage result is uncertain. If the screen has missing segments or fails to acknowledge a permitted change, include a clear description of that display behaviour in the enquiry.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.