How do you know that? With dynamic IP addresses (which most users have) the number of users from one IP address has no limit - and if that IP address is from a mobile network then it highly conceivable that you will have multiple users.
No, the user's post count per IP and user is calculated "on the fly" - every post has it's own information about the poster's IP. There is no function in pphBB to clear those informations by default.
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