Off Set Objects Not Showing Up in Mission Play

[sgt_fresh]

This really looks cool at Fort Perrone, Desert map. I was able to place artillery units on the castle turrets. They showed up from the map view after I hit the enter key (3d view). When I played the mission: https://youtu.be/5D9F4sg780c The artillery did not show up or it was encased at ground level within the fort walls. The offset was set at 12.

I have successfully placed AAA guns on static ship platforms in the past, but now they also dissapear on game start. Is there something i am forgetting to do in the mission editor?

Thanks in advance for any solutions.