I don't use that part of the filters, but it seems it's sorted by the number of items linked to this or that category for the programs. Indeed it would be better to sort by names. OR at least all named "Poser xx" first (like it's a Rendo programe now) then all DS, then what order is wished by Rendo team for the other programs.

That, or sub categories: Poser (and sub for each version), DS (and sub for each version)... The question is, are the "needed for G8F/M" and other categories like "ONLY" really needed? We don't see that for the other characters; it's more something the creatords should say on the page to present the freebies.