I, too, am having issues with this. I have duplicate entries. But I have checked the accounts, under preferences, and have no entries. But yet my subscriptions have duplicates on my iPhone and even old calendars that I have deleted from iCal are still showing up when I sync my iPhone. I've even tried replacing all the calendars on my iPhone with no avail.
I, too, am having issues with this. I have duplicate entries. But I have checked the accounts, under preferences, and have no entries. But yet my subscriptions have duplicates on my iPhone and even old calendars that I have deleted from iCal are still showing up when I sync my iPhone. I've even tried replacing all the calendars on my iPhone with no avail.
Verify:
If you want to use iCloud, you need to disables the calendar sync feature on iTunes, if this its enable it will duplicate entries in most cases (Happened to me).
Second, verify on your iPhone, calendar tab (Upper left corner) what calendar are you using simultaneously i just leave iCloud, and it has worked without trouble.