Your answer to this questionthis question was accepted on 21 August, but unaccepted again 9 seconds lateraccepted on 21 August, but unaccepted again 9 seconds later. (It was accepted yet again a day later.) I guess this is the reason for the 0 rep showing up for 21 August on your reputation report. Of course it would make more sense if the whole thing just wouldn't show up if there's no link you can follow. And judging by Nick Craver's comment of 22 September here, I'd say this is a bug.
replaced http://meta.stackexchange.com/ with https://meta.stackexchange.com/
link to implementation how unaccepts should be shown in the reputation report
Hendrik Vogt
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