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Yesterday I saw my reputation as 1024. I didn't have any activity on Stack Overflow. But today it shows reputation as 910. What is reason for this?

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Probably, one of your post got flagged as spam/offensive, check at and look for -100 post

Quick calculations on your posts is like this

From Questions       : 240
From Answers         : 875
Bounty you've set    : -100 (two 50 bounties)
Got Downvoted        : -46
Answers you accepted : 38
Downvotes you gave   : -7
Initial              : 1
                    ~ 1001 (approximately)

Now you have 910, so you are losing around 100, so most likely it was because of a post, which got flagged as spam/offensive (6 flags needed to be happened)

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Or he could have answered a question which got deleted. If a re-calc happened (happens for various reasons) then his rep would also go down, and the missing rep would not appear in /reputation – devinb May 25 '10 at 12:43

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