Actually it would not be a bug as User's requested in the 3.0 series of Reviewpost to open up the reviews section and allow a user to post more than one time.
Reviewpost use to allow only one review by a user but user's of the product revolted and in mass wanted the ability to be able to respond to other reviews etc so it was unlocked and multiple reviews by the same person are allowed so it works more like a forum thread. If you want to edit your review hit the edit button on the review.
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