Not sure what’s happening with the ranking algorithm, but it seems like the default main page is still displaying the same set of popular posts from a few days ago.
But if you switch to sorting by “Top Day,” it’ll show fresh popular posts from the past day.
i’ve been struggling with this problem and don’t know what to do - but at least it sounds like it’s not just me.
Mine ended up being that someone already took my username. They aren’t using it by the looks of it, though. :\