hmm, looks like a race condition on close. I cleaned up and we'll look into it.
edit: we identified a bug in our code that could allow this, and fixed it.
Looks like a race condition to me.
migrated to superuser.com by John Rasch (1), Dustin Laine (2), Kibbee (3), ar (4), Shiraz Bhaiji (5), martin clayton (6) 25 mins ago
Apparently you and Shiraz Bhaiji voted to close at exactly the same time, and the system migrated it twice in near-parallel.