Grease-like residue and mineral-looking spots describe different results. Programme suitability, product use and load soiling may be relevant, but appearance alone does not establish the exact cause.
Understanding this situation
A quick cycle used for heavily greasy cookware creates a different context from a familiar suitable programme that suddenly changes. Keep those facts separate from an assumption about failed heating.
A useful next step
Use the correct supported detergent and programme and follow approved maintenance. Do not add washing-up liquid or mix cleaners. If the film persists across sensible loads, report the distribution and programme behaviour for assessment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.