Stop forcing it, especially when hot or carrying fat. The pan may be mis-seated, distorted or incompatible with its supports.
What the observation means
A detachable handle, grid or tray edge can also catch independently of the rails. The immediate priority is secure handling rather than completing the cooking programme.
A useful next step
Let the assembly cool safely before checking the permitted owner arrangement. If it still does not slide securely, leave it unused and describe the obstruction. Do not bend rails, grind an edge or pull sharply on a full pan to free it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.