They can need different drying treatment and reach a finish at different rates. A mixed load can leave thick items damp while thin pieces have already had enough heat.
Understanding this situation
The textile labels and programme table decide whether the combination is suitable. A larger capacity does not remove the need to sort by compatible fabric care and construction.
A useful next step
Create appropriate drying groups before starting. After safe unloading, finish any damp items using their permitted method. Do not choose the most intensive setting for everything simply because one towel is slower than the rest.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.