Stop using it and obtain urgent competent electrical assessment. Do not touch it again to confirm the sensation or ask another person to test it.
What the observation means
Moisture and surrounding metalwork can increase the danger. Use only a safely accessible means of isolation if this can be done without exposure; otherwise get appropriate help.
A useful next step
Keep others away and report exactly what happened. Do not remove the hob, open connections or assume rubber footwear makes continued cooking safe. An ordinary booking should clearly state that an electrical safety concern is involved.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.