Because the routes between e.g. Neumann V, Fulgora, and Nauvis are 5,000 km each, but the route between Nauvis and Fulgora directly is 15,000 km, it's shorter to travel between Nauvis and Fulgora via Neumann V. All the other routes added by this mod have the same problem. They're all 5,000 km, except Nix / Fulgora which is 7,000km.
Route distances should be more in line with vanilla planets' distances, not considerably shorter.