The cavity and its upper components retain heat from grilling. Starting a delicate bake immediately afterwards is not the same as a controlled preheat from cold.
What the observation means
The selected oven mode may be correct while the early heat distribution still reflects the previous use. A small cavity can make this difference especially noticeable.
A useful next step
Follow the manual's transition and preheating guidance, allowing the required conditions before loading. Record preceding grill use if the top of food scorches unexpectedly. Do not cool the cavity with water or hold the door open while a heating mode runs as an improvised temperature adjustment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.