I was answering Android, Connecting to MySQL using PHP: Null Pointer exception; when I clicked "Post Answer," I accidentally clicked the backspace a split second later, causing my browser to go back a page and then was asked if I was human or not. I typed in the captcha and then I had two duplicate answers on that one question.
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This isn't a bug—from your explanation, it's clear that you submitted the post twice.
It's not a bug since the reason it happened is technically by-design (submitting an answer is a normal feature of the site).
I would be interested in introducing a feature that either limits the timeframe between which multiple answers can be posted on a question or automatically identifies duplicate posts on the same question.
Either way, most you can do is delete one of the duplicates.