Thermostat behaving abnormally

Hi

When I go to bed I manually set my thermostat to 17.5 so the temperature never falls below and when we wake up it is not too cold.

However, recently in the morning the temperature is actually BELOW what i set.

There is not an 'auto' programme set on there either.

Example:
When waking up the temp is 16.

But, I had set it to 17.5, as can be seen when i press the 'i' button.

Thanks

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