Removing a room Thermostat

Can someone please explain why the app/website doesn't allow me to remove a room thermostat??? I have a new one, replaced the old one, but the app will not let me :-

a) remove the old thermostat

b) reconfigure the new thermostat as the zone controller.

c) move either thermostat to a new room as it insists both are the last device in the room

It also insists that my old (broken) thermostat is controlling my boiler, which would be amazing as it's currently packed up in a box waiting to be posted....

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