Answers/comments are listed twice in the inbox

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The problem described http://askbot.org/en/question/2932/answerscomments-are-listed-twice-in-the-inbox/ (here) was fixed in 2011, yet it still happens at the https://ask.fedoraproject.org/question/24065/duplicated-alerts/ (Fedora) site that uses Askbot. Any idea why?