Here also, 16 is a node that has been in use and was deleted at some point or was occupied as the result of an attempt to pair a device that failed. The node where it shows (6) is marked Unknown and is probably out of reach or without power.
So it is a result of node 6 getting Unknown and showing a strange route where node 16 is displayed for some obscure reason.
This shouldn’t affect your mesh because node 6 itself isn’t used in any path anymore
