S9 Plus Notifications Problem

[Android Central Question]

Caption this: I have a conversation on Instagram and when I close the app, all the message that I allready saw are coming as notifications. It's annoying. Or open the app and not be able to see all messages. Or if someone text me on whatsapp I get the notification several minutes after message was sent. I need this to work properly as I use the phone for work.
Any suggestions ?

 

[lucianus_luciferus]

have you tried clearing cache and restarting phone?
or maybe reinstalling the apps?