Vibration

check individual app notification setting

You can go to Settings - Sounds and Vibration- Vibration Intensity and set the notification Intensity to zero by sliding it to the left. This will ensure receiving notifications will not make your phone vibrate at all.

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Going back to your concern, I am very sorry that you're experiencing this kind of issues. No worries, I'll try my best to help you out! As per checking thru the comment section, you already tried to check the applications settings and the settings of your device. What I can suggest is for you to reset your settings. Settings > General Management > Reset > Reset Settings 

Right after you reset your settings, you may navigate the settings of the application then turn off the vibration mode. If problem still persists, don't hesitate to give us a call. Our Samsung family is willing to help you. Stay safe and have a nice day ahead!