hmmm...ok I'll have an engineer look into it. Do you have a save game?
Sorry, pshaw, no save game.
I get the impression the routing algorithm is testing for the best path after each move. In this case, it seems to pick a direction then "changes its mind", so to speak, and ends up going back to the original tile.
One other thing-- in recent game incarnations, the proposed on-screen path can no longer be trusted. None of the ships actually follow that path in many cases (unless it's a straight line). I sometimes depend on that path to avoid "bad guys" or to simply eliminate some FoW along the way to a destination.
Thanks for your help,
Richard