First, be sure you use the KLAX-supplied AFCAD, meaning you should remove any AFCAD that might have been eventually installed by the Traffic program.
Other then that, the parkings in any scenery (this is not really related to KLAX) are assigned by FSX checking the airplane size in the MDL file of the AI airplane, it might be worth checking if is set correctly in those A380, THEN we might check it against the radius in the scenery AFCAD.
But before doing anything, be sure you use the AFCAD that comes with KLAX.