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Old April 3rd, 2013 (04:28 PM).
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Petie Petie is offline
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Join Date: Nov 2008
Location: New Jersey
Age: 26
Gender: Male
Posts: 145
If I remember correctly (it's been a while since I've used vBulletin), posts and threads have not only the user ID stored, but the username as well (which is one of the main reason username changes on huge forums can be a very CPU-intensive process). It's likely just referencing the stored username when showing the last post which, unfortunately, ignores your modifications to the code that retrieves a username.