Greetings sergiu217,
It sounds as though you're receiving notifications and they're showing correctly on your iPhone, but when viewing the messages for those apps on another device the notifications remain. If so, this may be expected as notification settings are specific to that device. If you’d like to provide feedback about notifications on iPhone, you can do so via the Product Feedback website. Apple appreciates all feedback regarding their products, services and features. Providing feedback ensures the appropriate individuals receive and review it.
You can also learn more about notifications on iPhone via the following article and verify the notifications on your iPhone via the steps listed below.
- "Go to Settings > Notifications.
- Under Display As, choose how you want notifications to appear on the Lock Screen:Count: Shows the total number of notifications at the bottom of the screen. You can tap the count to see notifications.
- Stack: Shows notifications stacked at the bottom of the screen, with the most recent notification at the top.
- List: Shows notifications in a list."
Use notifications on your iPhone or iPad
Take care!