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I get the same thing from our Tado. The thermostat is reading the correct temperature, it's just the app having this strange idea that every room needs to be at 21ºc to be comfortable.
Our heating is set to 19ºc, and the app has told me we are consistently 'cold' for the six or so months we've had it.
If the room is comfortable you need to tweak the offset on the valve or temp reader.