Clicking on a folder only ever shows 3 stories

If I click on a folder, my expectation is that it will run through all of the stories of each feed that is part of that folder. Instead, it only shows 3 stories, then stops, regardless of how many stories remain to be shown. If I click on the folder again, it shows 3 more stories, then stops again.

I’m currently setup as Unread, Feed, Full.
Style is Bottom, Single Stories, Auto layout.

This happens on both Firefox and Chrome.

If you’re not a premium subscriber, you should see a note at the bottom of the 3 stories saying you need to upgrade to read by folder.

I don’t see a message but that makes sense. Thanks!