Null Device Question

I have a Null device showing up in my Zigbee report. Is this something I should be concerned about? Don't know what it is. All my devices are accounted for. Also, I am having a few issues with lights occasionally dropping off. Could this have anything to do it?

That’s the hub I believe

Here's another instance

I thought devices that directly connected to the hub would show up in the first list (child devices), and ones that route through other devices would appear in the "table" below. The only time I've seen null there is with an Xbee that managed to join the network but never quite made it to the Hubitat device database (got stuck on "initializating," a problem I haven't had since).

I thought 0000 was the primary coordinator (the hub). I might be mistaken though :man_shrugging: