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I have 2 devices here, an iPhone 4S with iOS 6 and 3S with iOS 5 on it. I've configured on both devices my google account with email and calendar enabled.
On the calendar I see two entries for one birthday.First entry is the one that iOS "sees" from the contacts and it is displayed with a present icon. ("Chris Van Beurden jarig")Next entry is one that iOS gets from gmail ("Verjaardag van Chris...")
If I now go to my settings > Mail, Contacts, Calendars > My gmail account, and there I flip the calendar slider to off, and I confirm to delete the calendar from the iPhone. I then slide the calender back to on. The result is that I now have 3 entries in my calendar for the same birthday:
1 entry for marked with the present icon and 2 other entries.
I now have like 10 entries per birthday before I found out where the issue came from (flipping the calendar on/off on the account).
The strange thing is that on my iOS 5 device I only have the birthday entry with the present icon, flipping the calendar on/off on that device does not give the same issue.
Same problem on IOS 6....
With my descritption above, I ment indeed that the issue is on iOS 6 and not on iOS 5.
I have the same issue. It started after upgrading my iPhone4 to iOS6. I then upgraded my phone to an iPhone5, and set it up by restoring from a backup of the iPhone4 - and the same thing happened. (It also happens on my iPad running iOS6).
Wierdly though - removing the gmail calendar in Settings does not make the duplicate entries disappear from Calendar on the iPhone (although it did on the iPad).
However, if I hide (not remove) all icloud calendars on the iPhone, the duplicates disappear.
I started unhiding my icloud calendars one by one. The duplicates reappear when I have 7 or more calendars unhidden (no matter which 7 they are).
Odd. And frustrating.