Just this week all my contacts now show double entries!!! Merging doesn't help.
My contacts are all showing double entries as of the past few days. What gives?
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What happens when you try to use the Merge function?
If you are using iCloud contacts, if the contacts are duplicated in iCloud.com/Contacts, see the first part of the article below.
If you see duplicate contacts after setting up iCloud Contacts - Apple Support