The duplication is likely not a malfunction but just the way the New Posts page works. It displays results based on the most accurate forum activity at the time of request instead of who is searching and what they have already seen.
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Have you tried the new Recent Activity page? http://www.mothering.com/community/forum.php?action=newposts
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This lists most recent threads & posts. When you get to the end you can click "More" and the next list will display. Get to the end of that and click "More" and so on, so you don't . You can click the "Summary View" and see only threads. Hover over the thread and you get options to click through to read a thread's first or last post or subscribe to the thread.Â
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Unclick "Summary View" and instead of a list of threads with new posts made to them you see individual posts, the title in the list being the first so many words of the post made to the thread. Just beneath it you'll see the poster's name, time, and the thread name hyperlinked to the actual thread.Â
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That might work better for you than the New Posts. 