Hi there!
I just noticed this strange “chain” in my ZigBee network:
(20 is an Ikea bulb)
How is it possible that device 8 routes 21 and also vice versa at the same time? 
(20 is an Ikea bulb)
Because Homey’s Zigbee page doesn’t show the full picture: it only shows one possible route from a node to Homey, even though a node can have multiple different routes, via different routers.
Here’s what the mesh looks like in 2D (I drew the arrows the other way around from the table you show, but all arrows should really be bidirectional):
It’s perfectly valid for node 21 to have both node 0 ánd node 8 as its “neighbours” at the same time. When it’s time to send a message, it will dynamically make a choice which node to send the message to.
Alternative Zigbee implementation like deCONZ and ZHA show this sort of network map instead of a flat 1D table like Homey does.
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Thank you Robert, very clear explanation.
I add it to my knowledge base 
