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I think that's because the vBulletin software drops a "non-permanent" (don't know the proper technical term) cookie on your machine. If you return while the cookie is still active, you'll see posts still marked as Unread. If you return after the cookie has expired, the new post counter is reset to zero.
I don't know if the "lifetime" of the cookie can be extended, but if it can that's something that only Man1c M0g could do.
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Religion: It's all fun and games until someone gets burned at the stake...
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