Hi, there is a problem with you boundary relation.
https://tools.geofabrik.de/osmi/?view=areas&lon=153.02430&lat=-27.40540&zoom=15
Schools normally have simpler mapping with an amenity=school tag on the boundary only serving as the container for all within. If you must use a relation, i.e. where campuses are in more than one property, a multipolygon type is probably more suitable.