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I downvoted an answer while reviewing and found that my reputation went down by one. I don't get this. Why did this happen? Shouldn't the OP's reputation only change by upvoting or downvoting his/her answer?

P.S. I'm not sure if I should be writing this in Biology meta. I have a feeling that it should be in Stack exchange meta.

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    $\begingroup$ Thank for asking it, I never yet noticed that a downvote cause a reputation change of the voter, too. (However very rarely I needed to use it, so that could be a cause I missed it). $\endgroup$ – Always Confused Sep 19 '16 at 18:28
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There is no need to ask this on meta.stackexchange, this is a topic which can be found in our help center. I really recommend that you take a look and read the important topics there. This gives a much better understanding of the community.

Regarding your reputation loss, when you downvote an answer, this person who wrote the answer looses two reputation points, the person which downvotes looses one point. This is done to show that this is an important event which shouldn't be done without reason. As @mattmdo pointed out this is not true if you downvote questions, here only the person who asked it will loose two points. See here for more information.

BTW: This is different on meta.bio, here up- and downvotes have no effect on your reputation and are either seen as agreement or disagreement with an argument.

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    $\begingroup$ I would emphasize that downvoting a question costs the voter no reputation, but downvoting an answer does. The person on the receiving end loses 2 rep regardless of which type of post it is. $\endgroup$ – MattDMo Aug 24 '16 at 23:08
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    $\begingroup$ @MattDMo Good point, I always forget to mention that. $\endgroup$ – Chris Aug 25 '16 at 10:29

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