BIS_fnc_spawnVehicle spawning underground issue

I am having an issue with BIS_fnc_spawnVehicle spawning my AA guns underground.

I have used BIS_fnc_spawnVehicle many times in missions ad have never had this issue.

I have swapped the AA guns with various vehicles and the exact same thing happens.

When I hijack the driver via MCC and drive a few metres the vehicle moves to ground level.

The Caches spawn on ground level before they are moved to their building positions.

I am working on Zargabad and using ACE mods.

I am lost. Any help appreciated.

Edit: Using createVehicle has the same issue. Why are the caches spawning on ground level but not the AA?

Could this be an issue with Locations?

//init.sqf

waituntil {!isnil "bis_fnc_init"};


_SideHQ = createCenter resistance;
_group = createGroup resistance;
West setFriend [resistance, 0];
resistance setFriend [West, 0];


[] execVM "MissionSetup.sqf";

//MissionSetup.sqf

waituntil {!isnil "bis_fnc_init"};


_TOWNpos = nearestObjects [[0,0,0], ["LocationLogic"], 10000];

for "_x" from 1 to 4 do {
_SelectTOWNpos = _TOWNpos select floor(random(count _TOWNpos));
_TOWNpos = _TOWNpos - [_SelectTOWNpos];
_cache = createVehicle ["LocalBasicAmmunitionBox", getPos _SelectTOWNpos, [], random(359), "NONE"];
sleep 1;
[_cache,1000,4] execVM "someBuildingPos.sqf";
sleep 1;
}; 


_AApos = nearestLocations [[0,0,0], ["FlatArea"], 10000];

for "_x" from 1 to 2 do {
_SelectAApos = _AApos select floor(random(count _AApos));
_AApos = _AApos - [_SelectAApos];
//_AA = createVehicle ["ZU23_TK_INS_EP1", getPos _SelectAApos, [], random(359), "NONE"]; // Same issue!
_AA = [getPos _SelectAApos, random(359), "ZU23_TK_INS_EP1", resistance] call BIS_fnc_spawnVehicle;
sleep 1;
}; 

Try

for "_x" from 1 to 2 do {
_SelectAApos = _AApos select floor(random(count _AApos));
_AApos = _AApos - [_SelectAApos];
[color="#FF0000"]_SelectAApos = getPos _SelectAApos;[/color]
_AA = [[color="#FF0000"]_SelectAApos[/color], random(359), "ZU23_TK_INS_EP1", resistance] call BIS_fnc_spawnVehicle;
[color="#FF0000"](_AA select 0) setPosATL [_SelectAApos select 0, _SelectAApos select 1, 0];[/color]
sleep 1;
};

A-HA! It worked. Brilliant!

I just finished spam-pasting game logics all over Zargabad to get around the problem. You've saved me the tedious task of looking for 100 flat areas to move them to. Many thanks.