I was just checking SO and found out that my reputation has dropped from about 1200/1300 to 593. What has happened? I didn't do anything special.
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- Any Stack Exchange user can ask a question
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Most likely, your reputation was recalculated. This could have been initiated by the system after detecting vote fraud, or by a moderator if you've recently had a lot of posts deleted (rep gained from deleted posts are not removed until a recalc).
For a reputation audit, visit http://stackoverflow.com/reputation. You can also trigger a recalc yourself by clicking the button at the bottom of the screen.