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My StackOverflow reputation got decreased 20 but I cannot see any new event in the history, not even a deleted question or down vote or anything.

Going through all how reputation works and how reputation system changed, etc just confused me more, so, forgive me if this feels like a duplicate to you. I "did" search and wasn't sure of the appropriate one.

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Extremely quick unupvotes /unaccept that are immediately after an upvote/accept don't show even though you see your rep fluctuate. Are you sure you have "show deleted posts" checked? –  Manishearth May 7 '12 at 0:28
    
Convert that to an answer and I will accept it. I remember seeing deleted question before so I thought this was the default, didn't remember / notice that I need to check some checkbox or so. Thanks. –  Meligy May 7 '12 at 0:32

1 Answer 1

up vote 5 down vote accepted

It can be due to "show removed posts" being unticked at the bottom of the page.

Alternatively, it can be this:

If an unaccept/unupvote/whatever is done within xyz seconds of the corresponding accept/upvote, the rep counter fluctuates (due to the magic realtime updates), but the history doesn't show it.

This is to prevent fickle users from flooding your rep history{*}.

Happened to me yesterday, my Chem.SE rep kept fluctuating every half a minute since an OP kept switching the accept tick between mine and someone else's answer.

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Well, that wasn't it. It wasn't a matter of time I think (was a deleted question that I answered and got upvoted) but a matter of not checking "show removed posts" checkbox (didn't notice it), which you prompted me to note in your comment on the question itself. –  Meligy May 7 '12 at 0:53
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@MohamedMeligy: Whoops, misread you comment as "I know its already ticked since I saw a deleted post before". Fixed –  Manishearth May 7 '12 at 0:56

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