Apparently it's a new feature on PR. Anytime someone leaves a comment on a review you also left a comment on, you will be notified. Fortunately, you can turn off this feature, as you and I did, because otherwise you could be bombarded with dozens of messages a day.
-- Edited on 10/17/12 6:26 PM --
------ No sewing project is ever a complete success nor a total failure.
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Bugs/Errors and Bug Fixes >> messages on PM delivered to me