I have two calendars on my mac. There are no duplicates on my mac. I don't have my calendars synced to iCloud on my iPhone or my mac so that isn't the cause of the problem. For some of my events there are 10 duplicates! Not sure why some have 2 and some have 10 duplicates or some number in between. I tried deleting the calendars on both my mac and iPhone and readded but this keeps happening. What can I do?