@gohan yes it confuses me too. I have a similar situation where my node with 2 sensors is recognized by Domoticz as 3 devices like: Temp, Hum, Temp+Hum.
Apparently Domoticz is able to recognize that the different sensors belong together, but sometimes, there is a disturbance or bad reception in one sensor message, and then Domoticz creates a new device for it.
That would not be such a problem, except that you do not know which device to show on the Domoticz dashboard. Personally, I choose the combined one, ignore the others, and live with it.
I do not know if this is a bug for the Domoticz people, maybe they can resolve this?