Why am i not getting any notifications?

I'm not getting notifications on my iPhone and I don't know why? My notification center is turned on but I still don't get the notification from kik or snapchat. But when I open snapchat up and refresh it I have snapchats from hours ago. Same with kik, when I open it, I have kik messages from different people that I never got a notification for.

I know most people will probably say it. But reset your phone. Turn the notifications off and on.

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