Duplicate events in iCal

I've just started using iCloud and now whenever it updates I get duplicate events in my calendar on my Mac.  I delete one copy of each event and all seems well until the next sync.  Is there a preference that I need to adjust to prevent this from happening? 

Hi Tony,
You'll find iCal Dupe Deleter here.
Thanks for the mention LexSchellings. However i don't believe it will work in this case. If the events are in different calendars then they won't be considered duplicate.
TonyInSF could you answer these 3 questions?
When you look at the calendar list in iCal what sections are the calendars under ("ON MY MAC, "ICLOUD", "EXCHANGE", "GOOGLE" etc.)? 
Are all the calendars checked when you look at the calendar list?
Where do you sync your calendars to?
(I'll also mention that iCal Dupe Deleter is donationware. If you do find it useful please donate.)
Best wishes
John M
As I sell software on my site and ask for donations, the Apple Support Communities Use Agreement requires that I state that I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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