Scale for thermostats not consistent

[rjenx]

Hello, first a great implementation of a thermostat. I would like to use it but there is one issue I would like you to resolve.

I have a Hive Thermostat which is located in the living room and multiple TRVs (not hive and various manufacturers), the TRVs are showing a scale which has 18 - 20 c at the extreme lower end of the scale while the Hive thermostat has the 18 - 20 c at the mid point of the scale.