whatsapp is duplicating contacts

I'm using the 4.4.2 version with the stock contacts app and having a problem that Whatsapp duplicates my contacts

Before installing whatsapp I had 1 contact:

Smith family
John 12345
Ann 98765


Now, after installing whatsapp I have 3 contacts:

Smith family
John 12345
Ann 98765

Smith family
John 12345
Whatsapp 12345

Smith family
Ann 98765
Whatsapp 98765

If the contact have only 1 phone number it doesn't duplicate itself.
No other change was made except installing whatsapp.

I filtered...

whatsapp is duplicating contacts

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