In http://www.proz.com/kudoz/494547 I submitted an answer, then reloaded the page, which (due to another bug), resubmitted the answer. As soon as I realized that, I hid the resubmitted answer.
After the asker chose an answer, I was notified TWICE that "Subject: [ProZ.com: KudoZ] Answer selected (phasey)"
My guess is that every answerer in the KuduZ page is being notified, although ProZ should send notifications only to unique users, since one might post more than one answer, or, as in my case, one might hide an answer and post another one.
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