Hello Jayel60,
Thanks for posting in the Apple Support Communities. We're happy to look into this with you.
We understand that you're running into issues with notifications on your iPhone. First, have you checked to make sure your notification settings haven't changed since the update? If not, this is a great place to start troubleshooting this issue.
Use notifications on your iPhone or iPad - Apple Support
Change notification settings on iPhone - Apple Support
Since noticing there was an issue, have you restarted your iPhone? If not, it's a good idea to give this option a try as it can correct some issues with your device.
Restart your iPhone - Apple Support
How to restart your iPhone X, 11, 12, 13, or later
1. Press and hold either volume button and the side button until the power-off slider appears.

2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
Keep us posted on what you find with your notification settings and if the restart helps.
Best regards.