Check which zone the timer is assigned to and whether it is a shutoff timer or an alarm-only function. The display should be interpreted through the manual.
What the observation means
Some hobs have independent timers for several zones; others share controls. A visible countdown can therefore refer to another pan.
A useful next step
Confirm the assignment before relying on it and continue supervising cooking. If a zone fails to stop after a correctly set shutoff timer, switch it off safely and seek advice. Do not assume every audible alarm ends every active cooking zone.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.