Resolved Duplicates in calendar. Not using iCloud

i have 2 calendars on mac. there no duplicates on mac. don't have calendars synced icloud on iphone or mac isn't cause of problem. of events there 10 duplicates! not sure why have 2 , have 10 duplicates or number in between. tried deleting calendars on both mac , iphone , readded keeps happening. can do?

 

anyone?

edit: problem turns out on mac. using same .ics file friend using on devices duplicates while doesn't. causing this?

 

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