Do not use a heat gun or improvised heating method on the gasket. Excess heat can damage the seal, liner or nearby components and can worsen closure.
What the observation tells you
A distorted-looking section may actually reflect an obstruction or door alignment issue. Heating it without identifying the cause risks changing a sound part. Internet advice for a different gasket material is not a verified procedure for your model.
A useful next step
Clean only as instructed, clear accessible packaging and report the persistent gap. Obtain model-specific advice or a compatible repair rather than applying heat, oil or adhesive.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.