Unrouted connections issue

Anyone know what would cause my breadboard view to show 16 of 17 nets routed – 1 connection still to be routed but when I click my mouse on this it says that there there are no unrouted connections in this view?
I have also physically checked and cant see anything obviously unconnected?

Look for a red pin or a tiny hidden ratsnest line - sometimes it does happen -.

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