The new value may not have been confirmed, or the chosen mode may allow only a particular range. Check the programme's normal adjustment sequence.
What the observation means
A flashing edit value can be different from the active setting. Automatic programmes can also limit manual changes. The key question is whether the interface rejects an unsupported request or forgets an allowed confirmed selection.
A useful next step
Record the mode, requested temperature and value that returns. Follow the manual's permitted sequence without repeatedly starting a hot test. If the oven changes confirmed settings by itself during use, stop relying on it until assessed; do not assume the display and actual heating remain trustworthy.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.