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Wow, that's an easy one. Google doesn't like duplicate content. It tries to determine which is the original, and ONLY that gets any ranking at all. Unfortunately, sometimes Google can't figure out which site is the original, or it chooses wrong.
In any case, you've cleanly and simply sabotaged your own site. If I were you, I'd have all the other cloned sites you put up redirect to your main site. Keep all that traffic on your main site, and only create new sites when you have new content.
-T
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