i wouldn't feel too bad about it. in fact, like over 10 of my hubs are flagged saying the exact same thing, yet all it effects is the score on them. when i contacted hubpages about that, they told me it's because if you blog on other site besides here. i.e. yahoo, myspace, and so on. then it'll flag your hub if you just copy and paste a blog, you may have written like a few years ago on myspace onto here. that's why i don't blog anywhere else except here anymore to avoid such issues. you see when i was a kid, i used to review films online since i was 13, so most of my reviews are copied and pasted from ones i wrote on yahoo a while back.
you catch my drift? it's probably only saying that because you have the same blog written on another site somewhere, as that would be the only explanation i can give. however, if that's not the case, then i don't know what to tell you then. anyway, i hope that helps.