Lately we've been getting a number of re-open candidates. Some of were last active as far back as two years. In some cases, the last edit that was made to them is what's referenced as the reason it's been added as a re-open review task, even when the last edit was more than a year ago.
For example, this question was last active more than a year ago. But it showed up on the review queue today. It hasn't been touched in a long time, yet it showed up for re-opening.
Other strangeness is stuff like the re-open queue showing 30+ items to review, then only 3 items are reviewed before you're done and the review queue is empty.
Also, questions are showing up multiple times over the course of a few days:
Showed up two days ago, today AND back in May. All were triggered by the same revision from three months ago.
So, all kinds of bugs here.