As the title says, when one syncs and ORBAT module to a unit, it will make the ORBAT icon follow that unit's group one the map but also overwrites its given groupID with the "text" attribute from the set ORBAT config. I strongly suggest to change that behaviour and let us apply our callsigns at will, or at least use the "textshort" attribute so groupIDs don't become too long. I've nailed down the responsible code already, it is line 39 in BIS_fnc_moduleStrategicMapORBAT.