This question already has an answer here:
My issue is, looking at the reviewing stats 4 hours before they are reset, everyone on the top reviewers list is on the maximum 20 reviews.
So why is it that I'm not on the list? I was on the list earlier today/yesterday once I'd finished my 20, and it appears I have been pushed off the list. Why does the list not extend if everyone is equal? And how is it ranked? As far as I can tell, it's not by latest done, as dreamcrash:
Finished his 20 after me.
I had a look around for posts on the topic, and came up with this, however, there doesn't appear to be an answer.
Edit: to make clear, however similar the question may seem to the questions this was marked duplicate of, neither of those questions have answers, which is exactly why I brought this question to light again.