I realized that I have less reputation (in SO) then when I looked before. I figured that someone must have withdrawn his up-vote but I am not sure. Am I right with this theory and how could I track that? (See what question the vote got withdrawn on?)
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If the reputation loss is unexpected, large (>50) and there is no trace in your profile. Its probably due to a rep recalculation, or the removal of suspicious votes. See also Over 400 reputation lost overnight.
Smaller changes are probably due to vote or acceptance withdrawal.