For the most recent attempts to add devices to your hub, (like the one at the bottom?) hit the "Refresh" button a few times and see if you get a "Remove" option. If you do, take that option. Removing the recent add failures that have come up as ghosts should allow your mesh to settle and routes for older devices should re-appear.
See this post - look at the "Built-in methods" section w/info that @jtp10181 provided.
