Not getting notifications from apps. When I open any particular then I get all the notifications.

[DiVenomous]

Please tell us some basic information before asking for help:
Model Name: Rog Phone 3
Firmware Version: latest update. Please check SS.
Rooted or not: NOT
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app): EVERY APP EXCEPT INSTAGRAM. (ALL APPS ARE UP TO DATE)
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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[DiVenomous]

Please find the attached Screenshot

[ARP_ASUS]

HI, 
Try this :
Make sure you are on latest software version which is .78 if not, you can check by
Go to setting => About => Software information.
Go to settings => Battery => PowerMaster  
Check under Battery settings if the App is allowed in Auto start Manager, The battery is set to balanced .

[badral07]

maybe your do not disturb is on