I think this is the most possible thing .. I have ( 3 ) Unknowns ..
I am sure they were devices that I never reset/removed correctly.
they are " ghosts" that the ZigBee chip thinks are still around but are not.
I do not think it hurts anything
And The only way I can figure to get rid of them would be to reset
zigbee and readd all my stuff .. and its not worth it.
See : [RELEASE] Zigbee Map app