Games are not tagged properly for platforms

Hi. I'm trying to find awesome old games from a few years ago but the filters are giving me some problems because some games are not tagged properly in terms of platforms. For example, Assassin's Creed III is tagged X360 while it was available on all major platforms at the time.

I'm guessing its tagged with X360 because that's what Gamespot reviewed it on? But there are other games that contain tags for all the major platforms like Assassin's Creed IV so I'm not sure.

Anyways, the problem is if I want to filter PC games from 2012. AC3 won't show up even though it was available on PC. Is this intentional or a bug? Can something be done about this?

If you're still having this issue, how are you searching?

If it's via the reviews page search then that searches on the review release date and only shows for the platforms tagged on the review (for AC3 there are 2 separate reviews for X360 and WiiU, none for PC), the actual game release tags do seem to be complete and AC3 does show when I search it under PC via the 'new-games' search page too.

Example PC game search filter