My Norton. List of devices

The list of devices on the home page of MyNorton includes two devices I don't recognise. 

The list does not include a Lenovo tablet that is listed on the services page for one of my products (N360).

I turned on the Lenovo and a few minutes later one of the unknown devices was flagged up as online. (the other wasn't).  Why would the name be different on these two screens, assuming it is the same device.

The other unknown device is currently being shown as "online less than one hour ago."  I have no idea what that could be.

 

Not exactly the end of the world, but doesn't inspire confidence.