DOTA-like unit ordering, need help

You know how in dota units go from 1 base to the other without going back to where they were spawned or wherever they started. Well i can get the units just to be ordered to regions and stuff, like the most obvious thing to do but sometimes units actually go backwards when they should keep going to the other base. Does anyone know why they are doing this?

let me see the map on bnet I think I know whats wrong. Btw look on bnet im whispering you right now 1:26AM 9/10/03

do they cast non-autocast spells?^^

Its because they are an AI player and have no other orders so they will just go back. You should just make a region that always makes em go to the point u want them to and when they run into it they will turn around. In DOTA im pretty sure once they reach their destination in the enemies base, if they dont have anything to attk they will return.

use the ai-ignore guard positions action