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Underfloor heating and radiators

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Hi,
I have a wired thermostat I replaced for my underfloor heating.
I have a wireless thermostat for my radiators along with some smart radiator valves.
The problem I seem to be having is when the underfloor heating is turned on, radiators are heating up also.
The undfloor heating is on a separate actuated valve, and aways worked independently before.
Any ideas on the potential issue?
Thanks