Question on Neutral Hostile Units

When I make some neutral hostile units move via a trigger (giving them a move to order), they go in that direction for a bit, but then they immediately start turning back to where they were once they are attacked...

How can I prevent them from doing this?

There are some fields in gameplay constants you can change, like "creeps camp radius" or something of that kind. With them, you can modify how far the creeps are allowed to go. Anywhere further than that and the creep AI automatically orders them back to base.

So if I set this value to 0, it should disable it?

*bump*

Yes, it will.