In the Marketplace > Search > Filters > Pack Types > Worlds,

why don't any of the options work? Whether I choose All Worlds, or Adventure Maps or any other option, the filter number goes to 1 when I click on the Back "<" button, but then goes back to 0 when I click back into the search box.

Just to be clear that I know how to use this search, the other search options, such as Skins, work fine, i.e., the Filters number stays at 1 and only all skins are filtered to me. In the All Worlds option, for example, only worlds should be filtered with the Filters number staying on 1, but it doesn't seem to work. Or, if filtering is actually taking place on Worlds, there is no clear indication to us in the form of the Filters number holding that single filter by displaying a 1... as in the case when I filter skins, for example.