Recently, I expanded the Review Queue list and saw a red dot on the Suggested Edits queue (if you don't know, that means that it's not empty), so I clicked on it (naturally). But as I was reviewing, I accidentally closed the tab, and when I hurried back to the queue, it was empty.
After a few minutes, after I've tried and failed to locate the post (as I've neglected to read the title earlier) to see what the verdict was, when I checked the Suggested Edit again, the suggested edit was back. I saw one "Community♦ reviewed this...", which meant that one more review was needed, so it shouldn't have disappeared from the queue. I completed the review, by the way.
Am I the only one to experience such a ghost review?