Some people ask for posts to be deleted, sometimes a mod will delete a whole string of off topic posts, sometimes threads are split or merged, all of which could cause some post count irregularities. Also, this board runs on antiquated software held together by chewing gum and rubber bands and powered by hamsters running in wheels, so I wouldn't be surprised if things occasionally just glitched.
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“The totally convinced and the totally stupid have too much in common for the resemblance to be accidental.”
-- Robert Anton Wilson