Zones, heating plan and temperatur sensor

Hi there.

I have a Zone with a Homey Heating Scheduler Plan, Temp sensor, a Thermostat, and a power switch.


But wonder why the plan is not showing the same current temperature from the sensor as the Thermostat ?,

Just now the Plan has 16.6, the sensor has 15.9 as the Thermostat also is using. So why has the Plan an another current temperature ?