Originally Posted by Syljmc
For those people who end up in this thread because they experience this issue: I've found a solution.
Go to: Settings --> Notifications --> Notification Sound --> "Silent" AND Settings --> Notifications --> Vibrate --> "Off"
Do this for single messages, or group messages, or both, whichever you need.
The problem is that if you set a sound (instead of silent) for these messages, but then set your phone to silent/vibrate, it will try to play the sound when you receive a message, but the phone, not Whatsapp, will "convert" it to vibrate.
Thanks for this. It was driving me crazy and could not find why it kept vibrating.