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I seem to have gained one reputation point on this question, for no apparent reason:

NSOperation vs Grand Central Dispatch

enter image description here

Is this a bug?

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I assume you downvoted a question on that post – psubsee2003 Sep 22 '13 at 20:55
...which was probably this answer: that was deleted two days ago. – Brad Larson Sep 22 '13 at 20:57
Yes. It's beacause you have downvoted on th post and that post has been removed – Sachin Sep 22 '13 at 20:57
Weird that it didn't record that in your reputation history... – animuson Sep 22 '13 at 20:59
Thanks, possibly I did downvote an answer on that question from the review queue, but as @animuson says, it's not appearing on my rep history. – Luke Girvin Sep 22 '13 at 21:03
@Luke Do you have "show removed posts" enabled at the bottom? Maybe it just doesn't show it to moderators since it involved a downvote. – animuson Sep 22 '13 at 21:06
@animuson: are deletion 'vote rebalancing' entries visible to mods normally? If so, do mods have an option to toggle the 'show removed posts' checkbox too? – Martijn Pieters Sep 22 '13 at 21:23
@Martijn I have a hunch that the downvoted and undownvoted events are hidden from moderators to preserve user anonymity. Other removal and reversal events are normally shown. And moderators only get that show/hide option on their own profiles. I'm not sure if it affects other profiles, though. I always have it on. – animuson Sep 22 '13 at 21:30
@psubsee2003 - I assume he downvoted an answer and not a question on that post. :) – hims056 Sep 23 '13 at 4:25
@animuson - yes, I have the 'show removed posts' box checked. – Luke Girvin Sep 23 '13 at 8:03
up vote 10 down vote accepted

The only thing I can think of that would cause such a rep change would be that you had previously downvoted an answer on the question, which would have cost 1 rep.

When an answer is deleted, all points gained or lost by users on it are refunded - in this case, you lost 1 rep on it by down voting, and the +1 is your refund.

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