Duplicate calendar entries on iPhone, but not in iCal (NOT using mobile.me)

Hi,
I've had a problem for a while (since iOS 3) where I get duplicate events on the iPhone (3GS and 4). It seems to happen for events that have been edited/deleted - they are not edited on the phone, rather a duplicate is made. It seems as if what is supposed to happen is iTunes deletes the old one, then creates a new one, only the old one is not being deleted. This is very annoying, especially for recurring events that get edited several times!
I have found several posts about duplicate contacts and calendar entries but they all seem to be pointing to a conflict with mobile.me which I do not use. This is a simple sync between iCal and iPhone using iTunes.
Does anyone know what could be causing this?

I used to have this issue on my original iPhone (the 2G from 2007). You have to reset your sync data. This should help you; http://support.apple.com/kb/TS1627?viewlocale=en_US BUT don't shoot the messenger on this as I did a quick Google search.

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