Brydo, is your thermostat in the same place? Mine is in my kitchen fairly close to the boiler where I left it because it wasn’t reliably transmitting information. It’s set around 23C at various times of the day because 23C is the temperature in that part of the kitchen, the strip thermometers on the walls around the other rooms all say it’s less than 23C (20-22C).
You could always check the temperature at the thermostat with a decent thermometer if you have one handy.
Now if I get time, I have a Nest thermostat to install, & that’s going to be a whole other can of worms with all the other gadgets coming on & off based upon temperature. Adding the geofencing dimension will really mess things up. (Nest thermostat was a freebie with a previous energy provider).