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It's because other people upvoted the post at the same time, or in the mean time while your page had not yet refreshed. When you hit the upvote button, the page refreshed and you were able to see the new amount, but it looked like you were the one who contributed the difference.

O i c... thx for info -- i thought there was some kind of Supersteem thing going on.
Now following u2 ;)

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