I have a bit of a backlog with lessons but I thought it was just the vocabulary of the last 2 levels. However, when I looked at wkstats, I saw I still had one vocabulary item from level 2 that I had never learned! Do I need to get through my whole backlog before I can learn it?
大いに is no longer on the site. The stats site just hasn’t updated yet (and might not ever, I’m not sure how that site works since it’s run by a user). It’s never going to appear in your queue.