We’re normally limited to 20 reopen votes per day. I was working my way through the queue today, reached 20, it gave me another one. Okay, weird, whatever, I kept going. Reached 30. Looked around on Meta to see if the limit had been increased, saw nothing. Asked on Chat (SO Close Vote Reviewers), no one knew anything. Went back to “all queues”, Reopen Votes is grayed out and it thanks me for doing 20 today.
Did the system glitch or something?
Update: per comments, the queue probably exceeded 150 temporarily, which increases votes to 40.
Screenshot from https://stackoverflow.com/review/reopen/stats: