A large open cover can gather smaller pieces into a bundle as the drum moves. That bundle can dry differently from loose separate garments.
Understanding this situation
Preparation should follow the bedding label and the appliance's guidance, including closures where appropriate. A compatible dry weight does not guarantee that an awkward mixed load will remain evenly distributed through both washing and drying.
A useful next step
Sort the load sensibly and avoid exceeding bulky-item limits. If items are trapped in a cover after the programme, separate them only after normal unloading and use a suitable finishing method. Do not reach into the moving drum to untangle them.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.