Food, packaging and fat can contact the heating area if the load is too high. A tray that slides into the compartment does not establish adequate clearance.
What the observation means
A rising topping or roasting bag can change height during cooking. The manual's grid and shelf arrangement is designed around suitable loads.
A useful next step
Use an appropriate cooking method for bulky items rather than squeezing them into the grill. Do not remove protective parts or hold the pan lower by hand. If contact or scorching occurred, stop and allow safe cooling before obtaining advice about residue or damage.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.