Simple way of moving units without them going back

I dont know wether anyone has notice but when you use
Unit Group - Order (Units in (Playable map area)) to Move To (Center of (Playable map area))
they always go back or they dont move.
1.They dont move because blizzard set the unit group to move only 12
2. i Dont Know why they go back

So i do it like this and they all move

Events
Unit - A unit enters ( Region <gen> )

Conditions
((Owner of (Entering unit)) Equal to Player 4 (Purple)) and ((((Entering unit) is A Hero) Equal to False)

Unit - Order (Entering unit) to Attack-Move To (Center of Units Region <gen>) :D

What do you prefer? No Lag or Lag? I did option 2 at first and my game lagged like hell when u summon. Im doing option 1, and im getting little lag when i summon, but units do get stuck for me, but they automaticly unclog.

i would say if your mass unit mass them one by one so event every 2 sec create one unit then new trigger event if food used by player is greater than or equl to 30 then turn off trigger

I believe they go back because of the unit guard positions, you can turn this off under the AI Actions.

i tried turning of ai guard postion but its still happans

You have to turn off guard positions just after the unit is created and for each unit created. Doing "turn off all guard positions" only once at the start of the map only affects the untis already on the map. BTW if you do this computer units can't patrol anymore.