My reputation is reduced without any notification. In fact I can't get to know why I've lost some points!
Even I checked my reputation list but nothing is mentioned there. Why?
Update: I know that some fluctuations happened due to the serial voting and users being removed. I mean another reduction other than these reductions.
You lost 20 reputation from an answer to a question that ended up deleted.
As to why this didn't show up on your account, my guess is it's because you don't have enough reputation to see deleted posts other than your own (even if the answer was your own, the question it was under was not, so the whole thread remains inaccessible to you until you have access to moderator tools.)
See this answer. There was some reputation fraud recently which, unfortunately, disproportionately affected Shiite users. You are an innocent bystander, but unfortunately a victim of sockpuppetry.
Your reputation history does mention the reason for the loss of reputation, on January 6 you lost 1120 points because four users were deleted.
I can't say for sure why those users were deleted, but likely those were socks used for vote fraud.
