I have the phantom motion sensors (and smoke sensors) problem, too. They show up as child devices of two Aeon Smart Switches (DSC06106).
This has been happening for months. The counts of the phantom devices keeps growing over time (had 13 motion sensors and 2 smoke sensors just now).
I tried the “configure node” trick of a previous poster (clicking on Devices, picking the smart switch device, then Advanced, then Commands, then “Configure node right now”. Doing this caused all the phantom devices to disappear. Thank you for that tip!
– Mike