I would just double check you haven't put it up someplace else, if it's not your content that you have written it might be up someplace else that's not being picked up by your checker. If you did write this from scratch in the hub editor... it's got to be a glitch... writing from scratch it's so hard to still come up with duplicate content.
I was just recommend either waiting to see if it goes away or rewriting it a bit here and there so it doesn't show up as duplicate anymore. I was going to go see your hub and check to see if I could find it anywhere online but I see it's no longer there... just write some new and fresh content and try putting up another hub, you'll get it!
Being picked up for duplicate content a couple of times now, (even though it's mine) I just rewrote and after 10 minutes the notice was gone. The links, I have had my hub picked as "over promotionable" once, it only had 2 links... it went away the next day on it's own.
I hope to see you write some more and try again! :)