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This answer which I wrote on Jan 7 has been my most upvoted answer up till now.

Last night when I was looking at my profile, it still had 7 upvotes, but this morning it only has 5.

How can this have happened, when it hasn't been downvoted (check the vote count), and I last edited it 15 minutes after posting it?

I'm not too worried about the votes, but just interested as to why that happened?

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timeline shows only 5 upvotes for your answer: stackoverflow.com/posts/8768627/timeline –  gnat Feb 17 '12 at 10:28
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@gnat - if the users were destroyed then it would be as if the user never existed and hence those votes would have never existed. –  ChrisF Feb 17 '12 at 10:31
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Oh well, I +1'd, so now you only need +1 more :P. –  Matt Feb 17 '12 at 10:33
    
@gnat I guarantee I had 7 upvotes - tried to look on Google Cache but doesn't have a recent enough snapshot –  Alex Coplan Feb 17 '12 at 10:33
    
haha thanks @Matt –  Alex Coplan Feb 17 '12 at 10:35

1 Answer 1

up vote 12 down vote accepted

I can think of a couple of cases:

  1. The users who provided those two up-votes are destroyed - all posts are deleted and all votes removed.
  2. The users were sock puppets of another user that also voted for that answer - so you ended up with 3 votes from the same person or 2 votes from 2 people. If the socks were discovered and merged then the duplicate votes will be removed.
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