Poor contact can affect heat transfer and stability, especially on surfaces designed for flat cookware. It is a cookware issue that can resemble weak or uneven heating.
What the observation means
A pan may rock when cool or change shape with heat. Do not press a hot pan down or load it with weight to flatten it.
A useful next step
Check the cookware's condition and compatibility while cool. Keep a damaged or unstable pan out of use. If the same hob zone behaves poorly with suitable undamaged cookware too, describe that wider pattern rather than assuming the pan alone explains it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.