Hello LouisianaCharm,
To help resolve this issue, turn notifications off for Messages, restart the iPhone and turn them back on:
Change notification settings on iPhone
Manage notifications for messages
- Go to Settings
> Notifications > Messages. - Choose options, including the following:
- Turn Allow Notifications on or off.
- Set the position and locations of message notifications.
- Choose the alert sound for message notifications.
- Choose when message previews should appear.
Restart your iPhone
Also, check your Focus settings to make sure you don't have any settings in place that could be causing this issue: Set up Focus on iPhone - Apple Support
Best Regards.