I've been wondering if I'm in some experiment sometime as well. Sometimes my r/popular will be filled with content from niche subreddits I don't follow with bar

I've been wondering if I'm in some experiment sometime as well. Sometimes my r/popular will be filled with content from niche subreddits I don't follow with barely any upvotes. The content is generally bad. Seems like a failed attempt at a "for you" page (and then I would just have browsed my own frontpage with subs I follow..) But if I refresh, it's back to "expected" content. So weird.