Hi Iamaqueen82,
To help us get a better understanding of the issue, we’d like to ask a few questions.
1. Is this happening with all notifications, or only notifications for the Messages app?
2. Are you using The Focus feature on your device?
"You can customize Focus settings and choose when you want to receive alerts and notifications, while letting other people and apps know when you’re busy."
Please check out this link, which has more information about using Focus, and managing those settings, which may be helpful: Use Focus on your iPhone or iPad
Set up a custom Focus
If you want to concentrate on an activity that's different from any of the provided Focus options, you can create a Custom Focus.
1. Go to Settings > Focus.
2. Tap the Add button
, then tap Custom or browse additional options.
3. Enter a name for your Focus.
4. Choose a color and an icon to represent your Focus, then tap Next.
5. Customize the options for your Focus.
Thanks!