One other part of this is GMs can hide client and won't show in the /who all. They do #gmhideme on / off. I do this on Anon if I need to check on suspicious behavior. So that will also show as a number.
False numbers will also show on boxing servers where one person can box more than one account. Each account logged in shows as one number. I know one server where one player plays 12 accounts so that's 12 added to the server number!
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