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I had a quick glance at my English Language and Usage account that I haven't visited in, ahem, quite a while and saw this little quirk in the change notification on the reputation tab:

Screenshot of my EL&U reputation tab

The two new changes sum to a 0 point net change, however the change indicator says -2. Whilst I agree that having the red indicator saying 0 would also be strange behaviour, surely it shouldn't show up at all when there is no net change?

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Possibly related: meta.stackexchange.com/a/157327/200500 –  Asad Dec 13 '12 at 23:53
    
@Asad interesting read, the numbers in this case however do add up correctly, it's just a strange way to be informed of the change. –  Rory Dec 13 '12 at 23:58
    
I should have added some context. What might have happened is that a couple of posts you downvoted (that were deleted) were undeleted, which would subtract two points but leave no visible evidence. There might be a simpler explanation though, this sounds like a stretch. –  Asad Dec 14 '12 at 0:02
    
@Asad Ahh, the downvote highlighted is on one of my questions by someone else that they later reversed. Sorry I should have made that clear! –  Rory Dec 14 '12 at 13:02
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1 Answer

I'm fairly sure this is by-design. Your reputation change (in the tab) gets updated upon a downvote, to sum to -2 for it. However, when events get reversed, the system doesn't also revert the change in the tab (it's probably a hassle to keep track of what events make up the reputation change you see there, since it resets whenever you dismiss it). This is similar to what happened in another question.

When a downvote gets reversed, you're not gaining 2 reputation, the -2 you received before is being reversed. The actual undownvote event in your reputation history is just a nice notice so you know why your reputation went back up by 2. Since it's reversing a previous event, it doesn't update the reputation change in the tab. So the -2 is from the downvote only, the undownvote is ignored.

As for whether or not it's a bug, I don't see any reason for the developers to spend much time on this. If it's not a simple fix for them, I'd say let it go. It does reset as soon as you look at your history, after all.

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