The were flagged enough times they were "outlawed" by the looks of it. This hides it unless you opt in to "wild west mode."

This was our first pass at group moderation. In the next version we'll probably want to make it clear that there's something there rather than just removing it.

If you'd like to see it by default (and other content like it), turn on "wild west mode" in your settings. I prefer to browse in wild west mode.