Those are different observations about the result of a pumping event. They are more informative than saying the unit sounded normal.
What the observation means
The sound and actual wastewater movement should be described separately. Water returning after a stop differs from water that never cleared at all.
A useful next step
Use observations already made and stop further use if drainage is uncertain. Do not repeat flushes to obtain a clearer sequence. Tell the service team the order of events without assuming that a particular valve or motor component has failed.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.