Device appears as concentrator

This the second time a zigbee device sudently turn into a concentrator in my routing table. Is it normal?

It is a sonoff mini switch. The last time it was a ikea repeater

I guess nobody know the answer... I read somewhere that there should be only one concentrator in a zigbee mesh.

I know that's true of the coordinator. Not sure if there can be multiple concentrators. As I understand it, a concentrator stores a portion of the routing table. A low ram concentrator stores a smaller portion than a high ram concentrator. Why a particular device suddenly becomes a concentrator, I can't answer!

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