Hello..
When I arrange the ships to deliver products to the ports that I have determined with the route, the ships follow different routes and sometimes tour in short distances and return without going where they need to go. In addition, I use Mods, but I have the same problem in a game that I tried from scratch by turning off all mods. The ships go where they need to go, but this time they return without unloading the product. Again, when the same ship sets off, it goes to an unrelated part of the island instead of the port it needs to go to to unload its cargo and returns.