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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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Deleting one of your answers is the correct thing to do here. – Jarrod Dixon Mar 7 '12 at 3:10

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.

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Sounds right. I assumed it realized I was trying to submit an answer too quickly thus asking me if I was human...but I didn't realize it took my first answer so I filled in the captcha. Then added the exact duplicate answer after I passed the human test – Aaron W. Mar 3 '12 at 5:50
    
@AaronW.: Yup. Seems like there's a page that's requested mid-submission, which is probably the one that you visited when clicking backspace. The automatic system detected you were posting consecutively within a short period of time so it ran the verification. – Mystery Mar 3 '12 at 5:56
    
There used to be a system that detected exact duplicate answers. Looks like that is no more then. – Martin Smith Mar 3 '12 at 10:38
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@MartinSmith Duplicate answers are still detected, but they get an automatic flag when the same exact answer is given for different questions. – kiamlaluno Mar 3 '12 at 14:27

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