I am an active contributor on the Software Recommendations SE. I perform a fair amount of volunteer moderation activities like responding to votes (but I am not a site moderator).
When I log into the site, directly next to the review button is a little numeric indicator that shows me how many Suggested Edits (and perhaps other things) are awaiting my review.
After I complete my reviews, the numeric indicator often decreases in value, but does not go to zero.
What am I missing? What is that indicator indicating? Or is it just broken?