The Zigbee Graph isn't an actual mesh map; its representation becomes less relevant to the actual mesh topology when links in the mesh are more than one repeater 'deep'.
It's useful to visualize the information that the 'getChildandRouteInfo' page provides, but for some links, that data only tracks what single hop neighbor repeaters are being used as first-hop 'vias' to other repeaters (likely not shown at all in the graph if they have no direct link to the hub).
In another thread I posted a couple of situations which get misrepresented by the graph: Zigbee graph: a couple of misleading scenarios