Hello Dpost377,
Thanks for reaching out to Apple Support Communities. We see you have some questions about your notifications still showing, after you've already read them, and we'd like to help. First, we'd like to make sure your device is updated, as this can help keep the most recent settings on your device: Update your iPhone or iPad - Apple Support
Update your iPhone or iPad wirelessly
1. Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see more than one software update option available, choose the one that you want to install.

5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.
Also, be sure to check your group messages, and scroll through those, to ensure nothing has been left unread.
You may also want to Restart your iPhone, to see if the issue remains.
Regards.