Make enemy not walk through platforms?

Any idea on how i would prevent my enemy from walking through platform objects?

 

What is the enemy objects collision type? If set to collide this should not occur

 

If you choose physics of collisions will work, but this makes the enemy off balance.
The best method I use "logic" and "sleep"

 

he is set as:
fixed movement
Collide
Distance based wake up and sleep

But still when awake glides right through a platform :/ if i change the platform to physics he brings it with him :/