iCloud duplicates contacts and groups it's frustrating
how do I prevent this from happening. Duplicate contacts, sometime triplicates, and the same with groups.
MacBook Air 13", macOS 10.14
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If you have signed in with same Apple ID and password on the same network in Mac and iPhone or other apple devices the contacts on each device will get synced , if the same contacts are in devices they will be seen as duplicates ( as if you had already created contacts in Mac and the same are in iPhone ) .
To avoid it , disconnect the desired device by just signing out from Apple ID account , then delete the duplicate contacts in each device .
See this article also https://support.apple.com/en-us/HT203565