Update There are a few interesting suggestions in the feedback from answers and comments but they are hard to test. Is there a dummy page for users to test site tools for repeatable bugs or for misinterpretation of controls? (Nothing relevant turns up when searching for "dummy". I'll make this a separate question if asked.)
In the image below, all the review queues show up empty. The brown box in the black header suggests that there are 5 items for me to review, but since that can't be right, what does the number mean (or is it a bug)? I've tried to confirm by refreshing the page that it isn't just a simple lag-effect - the number was is still 5 and the queues were still empty after the refresh. Note that the number does decrease as I process non-empty queues.