Hi Severin.
This may not be your case, but my iPhone did that recently after an update.
It turned out that it was listing “from my Mac” and “from iCloud”.

> On 19 Dec 2017, at 11:40 am, Severin Crisp <sevcr...@westnet.com.au> wrote:
> 
> On our phone, iPads and desktops I have 5 Contacts (Address) Books all shared 
> and working fine.   Recently, by some unknown circumstance all the cards on 
> the book in my MacAir are duplicated identically.  Card/Look for Duplicates 
> insists that there are no duplicates.   I would like to fully clear out the 
> entries and let it reshare but of course High Sierra security makes this 
> difficult.  
> Suggestions please.  
> Severin Crisp
> ____________________________________________________
> 
>              Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
> 15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
>                   ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
>         Mob  0484 624 741    mail to: sevcr...@westnet.com.au 
> <mailto:sevcr...@westnet.com.au>
>   _________________________________________
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Regards,
Stephen Chape






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