Category view article list differs from feeds in category

[wxs]

I recently reorganized a number of my feeds into new categories. Those feeds now show up properly in FeedHQ (and in Feeddler) as in the correct category. However, if I try to read the entire category at once (e.g. by visiting https://feedhq.org/category/science/) I find that it only shows articles from some of the feeds (I believe it shows them from those feeds that were originally in the category before I reorganized, though I'm not sure).