Duplicate entires in calender

Hi,

I have had windows devices for years now, and for some reason over the years every person that I have put there birthday in with there contact details has about 6 - 8 entries in my calender.

Its very annoying, Im going to wipe my calender clean and start fresh but I dont want it to happen again.

Does anybody know what causes this so I can avoid it.

Thanks

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