Hi,
Relation 	15752535  is wrong. Multipolygon relations outer ways cannot share segments.... 
See 
https://tools.geofabrik.de/osmi/?view=areas&lon=115.71137&lat=-32.53851&zoom=15&baselayer=Geofabrik%20Standard&overlays=duplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways%2Cduplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways
https://wiki.openstreetmap.org/wiki/Relation:multipolygon#Overlapping,_unclosed_member_ways_belonging_to_the_same_role

The changeset comments could be better - see https://wiki.openstreetmap.org/wiki/Good_changeset_comments