I changed the zombie placement to make this issue easier to see. Zombies all face a single direction instead of the direction they are moving. Skeletons movement will be done based on which way their bone (throwable weapon) is aiming.
dropbox.com/s/3di09v8o7avwhe4/Roots%20Of%20The%20Forest.c3p
With one zombie it works fine.
(Also skeletons are moving together based on a single skeleton instead of when i get close to one)
Zombie movement is handled under move to in enemies