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I had reputation of 104 it fell down to 96 the next time I logged in. Why is that ?

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    $\begingroup$ In the reputation page, on the very bottom there is a checkbox "Show deleted posts". Check it. $\endgroup$ – Asaf Karagila Sep 4 '15 at 7:47
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    $\begingroup$ The Australian dollar went down, too. Is your reputation in Australian? $\endgroup$ – Gerry Myerson Sep 4 '15 at 13:00
  • $\begingroup$ @Gerry: Did it fall by 8 points, though? $\endgroup$ – Asaf Karagila Sep 4 '15 at 15:32
  • $\begingroup$ See also: meta.math.stackexchange.com/questions/18884/… $\endgroup$ – Martin Sleziak Dec 1 '15 at 18:35
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There are several reasons why reputation can go down (some of them mentioned in the other answer), let me complement and expand that a bit:

  1. If a post gets deleted (by the system or users), then typically the reputation gained from that post is removed (there are exceptions for posts on the site, since a longer time and with good score). It is quite likely you were affected by this, and Asaf explains how to find out.

  2. If one of your posts get down-voted you lose two points (except it was in CW mode). However, this would show on your reputation page.

  3. If one down-votes answers you also lose points a point, but you cannot yet down-vote.

  4. If a user gets deleted their votes are invalidated, so if a now deleted user voted for you this could result in loss of point. However, this would also show in your reputation page (user was removed). There are also other scenarios in which votes are invalidated, but again this would show (as voting correct).

  5. If a user un-accepts an answer the answerer also loses the points. But again this would show in the reputation page.

Long story short: go to the reputation page and check the mark "show removed posts" Typically you will find the reason there, and it should be the first one.

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    $\begingroup$ You're very loose with the spelling of "lose". :-) $\endgroup$ – Asaf Karagila Sep 4 '15 at 11:13
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    $\begingroup$ Well, I am just a looser when it comes to spelling. $\endgroup$ – quid Sep 4 '15 at 11:40
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    $\begingroup$ If you're too loose, you're bound to lose. And if you are bound to lose, you'll eventually be cut loose. $\endgroup$ – Asaf Karagila Sep 4 '15 at 12:23
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    $\begingroup$ I like to play it fast and lose. No wait, want to win. $\endgroup$ – quid Sep 4 '15 at 12:29
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It may be due to a variety of reasons-

  • User was removed-Let you have posted an answer to User A's question and earned some reputation.User A was removed due to some reason.
  • You downvoted something.
  • Your question was downvoted.
  • You deleted a question in which you had gained some reputation.
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