Default Moto G vibrates on notifications but should'nt !

Hi there.
I m on a the retail ROM FR 4.3 version.
I always use my phone on viber mode.
I m interesting with the viber only for SMS and calls.
Despite I uncheck the viber notification on several apps settings like K9 mail, Gmail, facebook... They are still vibrating when I receive a notification.
Is someone has the dame problem ?
And any idea to resolve it ?
Thanks per advance.

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