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I posted a question, "Show that $\int_0^{\pi/3}\arccos(2\sin^2 x-\cos x)\mathrm dx=\frac{\pi^2}{5}$".

Yesterday its score suddenly decreased from $25$ to $22$, and I wonder why. The question has $1$ downvote, given six days ago. Yesterday the question earned a "Good question" badge (score of $25$). After that I got a message, "$-10$ User removed".

It's of no importance; just curious.

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    $\begingroup$ Sometimes people who are acting maliciously also vote up good questions. I believe that when a user gets removed all of their votes are revoked, so that would account for 10 rep points and one up vote going away. But 3 up votes disappearing? That's odd. Maaaaybe a person was running 3 different accounts got detected? But staff tends to keep pretty closed mouths about the details of account deletions, so you're unlikely to find out. $\endgroup$
    – JonathanZ
    Jan 11 at 17:22
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    $\begingroup$ @JonathanZ Thanks. If one person was running three accounts, and then that person was removed, then I would guess that I should have received three messages that said "-10 User removed", but I only received one such message. Oh well. $\endgroup$
    – Dan
    Jan 11 at 23:10

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