Radiator valve not turning off when up to temperature

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Hi,

I’ve got the Tado wireless kit and 11 radiator valves. Most of this seems to be working really well, however in 2 rooms, the radiator valve is reading a temperature of around 24 degrees, even when set to 18 and the radiator is still on full blast. The radiators are behind furniture, so will be giving a slightly false reading anyway, but I’m confused as to why the valve is even still on if reading a temp higher than it’s set to.

Any help appreciated.
Dom