There are two cities called Mosman in NSW, Australia. One is Mosman Muncipal Council and the other is simply Mosman, which is a suburb within Mosman Muncipal Council.
The suburb Mosman is shown in CityStrides with the same boundaries as its parent city Mosman Muncipal Council, meaning that the other nested suburbs within Mosman Muncipal Council (Balmoral and Clifton Gardens) do not appear in CityStrides at all (as far as I can tell).
Could there be some issue with the set-up/import of the cities collection?