Voting to close does not close it instantly for the "Off topic" and "Not a real question" close reasons — it merely casts a vote and also allows one to keep casting more than the maximum of 5 needed to actually close. The vote chain is broken and closed only if a different reason is chosen. This behaviour has been reproduced on Gardening & Landscaping and Digital Signal Processing. Possibly, the same bug as this classic. Screenshots below:
Now that's one crazy moderator!