Upsmon not working with spawned groups?

[jakkob4682 23]

_locations = nearestLocations [player,["StrongpointArea"],500];
{
mrk = createMarker [str(random 100),position _x];
mrk setMarkerShape "Ellipse";
mrk setMarkerSize [100,100];
mrk setMarkerColor "ColorRed";
_grp = [(position _x),east,(configFile>>"CfgGroups">>"EAST">>"BIS_TK_INS">>"Infantry">>"TK_INS_Patrol")] call BIS_fnc_spawnGroup;
null = [(leader _grp),mrk,"spawned","onroad"] execVM "scripts\upsmon.sqf";
}forEach _locations;

Am I doing something wrong? When the groups are spawned I am getting a surrendered message.