Glad I could help <img src="smileys/smiley1.gif" border="0" align="middle" />
For those who don't wanna download the .capx, my fix was this:
Give the enemy the "Custom Movement" behaviour, and set an event
"Enemy - On collision with: Enemy - Enemy - Push out solid - Nearest"
<img src="http://imageshack.us/a/img600/415/gjrz.jpg" border="0" />
Don't know if it fully fixes the problem, but hopefully it'll help.