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['thul]

These beings believe they know the cause of the error.

This theory is based on the following:
You copied that thread on what are you reading now, split the copy in half, then deleted the original (unsplit)

'thul know from experience with php-based forums that copied threads/posts do not count towards post counts. Thus copied/uncopied threads/posts have a difference in tag in the database behind the forums. When you deleted the original, the ones tagged as to count in post counts were removed. The total post count for forums is still correct, since that ignores the tag described above.

There's an easy and a complex solution.
The complex one is to go through the database and find all the posts in those two threads then retagging them correctly one by one.
The easy solution is to press a funky button in the ACP, probably on the main screen there, that resyncronizes post counts. That should perform a check on all posts to find posts with unique IDs and count them all towards post counts. When a post is copied, both versions have the same unique ID, and will thus only count once towards post count.

But if that theory is not quite correct and it would take a complex solution, then it probably is not worth the bother. It is only a post count error, not missing posts.