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I dont understand why, but today when I loggedin to my SO Ac , my reputation is 874. I am logging in after 3 days and this is what I am seeing. Earlier it was 2K + something. I can't see a reason for this.

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Dupe many times over. Your rep got recalculated. This is normal. – Billy ONeal Nov 8 '10 at 5:18
    
@Billy That's a pretty epic loss for just a recalc – Michael Mrozek Nov 8 '10 at 5:41
    
@Michael this really should have been sent to team@stackoverflow.com ... there is no bug here – waffles Nov 8 '10 at 5:50
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@waffles Well, it should've been tagged [support], but I was saying 1200 rep from a 2000 rep user being lost to deleted posts is unusually high; it was probably spam posts or vote-spam detection like dmckee said – Michael Mrozek Nov 8 '10 at 5:52
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@waffles, if it's not a bug, then how about revealing what happened. – Lance Roberts Nov 8 '10 at 6:02
    
@Lance an account was merged – waffles Nov 8 '10 at 7:31
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@Waffles How did merging an account cause such a significant rep loss? – Justin Nov 8 '10 at 8:25
    
@waffles, thanks. – Lance Roberts Nov 8 '10 at 15:36
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@Kragen: I have no specific knowledge of this case, but that effect can be produced by lots of cross-upvoting. – mmyers Nov 8 '10 at 17:13

Large losses usually mean either

  • multiple posts judged as spam or offensive and deleted (your profile shows no signs of this)
  • a lot of modest losses all hitting at one due to a rep recalc (likely if you have had many questions deleted)
  • a great many votes deleted because they were judged to have originated from sock-puppets or a mutual admiration arrangement
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Does /reputation show losses from flagged posts? I guess probably not since they've been deleted – Michael Mrozek Nov 8 '10 at 5:42
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If it's the third, there should be a message saying "We've noticed your behaviour. This is why you lost your reputation. You don't need to thank us for it." – Andrew Grimm Nov 8 '10 at 5:54
    
@Michael Actually, you get a special entry for flag-deleted posts. PostId 12, if I'm not mistaken. – Grace Note Nov 8 '10 at 13:52
    
In one case of cross-voting, a higher-up said the cross-voter should have been notified by email, but wasn't by mistake. It sounds like this person wasn't notified either. – Andrew Grimm Nov 9 '10 at 12:02

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