Stray device in Zigbee Visualisation

What would be the reason for a random un-connected(?) device in the visualisation view?

The device ‘Button 1’ shown top left is working, but doesn’t show the link to the ZBT-2.
The ZBT-2 was added in place of a SONOFF stick aound 4 weeks ago.
The battery in ‘Button 1’ was replaced around 2 weeks ago.
At least two other devices have also had batteries replaced recently, but all still show a connection to the ZBT.

I’ve only recently looked at this view, so have no idea when that floater appeared.
Everything is working ok.

The device could be sleeping at the moment you generated the map. A floating device is nothing to worry about if it works.

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Yes. It works fine. I just wondered if there was a common reason for the behaviour.
It’s been like that for day’s now.

My network is like that all the time. I have over 100 devices though.