How do i stop a unit from being pushed around by flying units?

[u wot m8_]

I've made a land unit based on the frost wyrm and cancelled everything i could find that has made it an air unit. But i can't seem to figure out which one of it's properties decides whether or not the unit gets pushed around by flying units. Which property should i change? Or is there something i need to do?

Thanks in advance.

 

[AbsolutePsycho]

Movement - Group Separation - Enabled: false
--> [General] - Air units "pushing" each others around