All of my notifications for Instagram are turned on but I still never get notified.

I had this problem for 3 weeks when I got a new phone. Worked on my iPad and on my husbands phone for my account but when I called Apple they claimed they didn’t know if anyone else experiencing this problem and it was instagrams fault. In the end I found one advisor who told me to attach phone to computer and do a complete erase of my phone and reinstall from iTunes. After having done an erase and reinstall from iCloud which didn’t make a difference and took me all day, this time instead of erasing then reinstalling from back up I set up the phone manually. This meant having to go to the App Store and redownload all my purchased apps and logon to them all again etc and even redownload all my music and two evenings later I’m still not completely done, but I’m pleased to say I now get Instagram notifications!!