Why won't my phone show my notifications for my apps? Like Instagram or Hangouts or kik

[AC Question]

I got a Samsung galaxy s7 in January. I have apps like hangouts, kik, Instagram that won't show notifications. I have the notification settings in the app on, as well as in the device's settings, yet the notifications never show up, not on my notification bar or on my lock screen.

 

[B. Diddy]

Welcome to Android Central! Any power-saving modes turned on, or 3rd party battery-saver or "RAM booster" apps installed? Also, is Restrict Background Data turned on in Settings>Data Usage​?