Wireless Thermostat pushes bedroom heat beyond that set on Radiator Thermostat

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I’ve recently moved the tado. I have a wireless thermostat in my front room, which is always coldest; a wired thermostat on a different zone for our underfloor kitchen heating, and then radiator thermostats for our bedroom and snug. That leaves 5 radiators with regular valves/thermostats. However, I’ve noticed that if I turn up the temp for the wireless thermostat to, say, 17, the temp in our bedroom can get as high as 30, even though it’s meant to only get as high as 20.5. I assume the wireless thermostat is pushing it higher/heating the bedroom radiator but surely the radiator thermostat should prevent that? What is maybe up with our setup?