Cannot move through zones

I loaded this for a few players who do to disabilities cannot do the fine tuning of the in game copters. 

But fo some reason the copter cannot move through any of the set zones . . . it forces itself abive them like its land. is there a solution for this? I would like to let all my players, even the disadvantaged enjoy the power of flight.

ill check which trigger that is and allow the zone layer to not act like terrain. that will be next update i hope :)