A tightly packed load has less room to separate during drying, which can contribute to an unsatisfactory creased finish. The result does not by itself identify a mechanical failure.
Understanding this situation
Look at the drying allowance, fabric mix and chosen target. A load that was acceptable for washing can become unsuitable for continuous drying, and leaving finished items compressed afterwards adds another factor.
A useful next step
Plan smaller compatible drying loads and unload after the safe finish. Follow garment instructions before ironing or rewashing. If creasing changes suddenly on suitable loads, record the programme and fabric rather than assuming that heat alone explains it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.