Thanks for reaching out Mysteriousmum7312,
It sounds like you have some concerns about how limits work in Screen Time. We can help.
If you're having trouble with limits for a particular app, you may need to remove the limit and add it back. You can follow these steps to Set up Screen Time for yourself on iPhone:
Set limits for app use
You can set a time limit for a category of apps (for example, Games or Social Networking) and for individual apps.
1. Go to Settings
> Screen Time, then turn on Screen Time if you haven’t already.
2. Tap App Limits, then tap Add Limit.
3. Select one or more app categories.
To set limits for individual apps, tap the category name to see all the apps in that category, then select the apps you want to limit. If you select multiple categories or apps, the time limit you set applies to all of them.
4. Tap Next, then set the amount of time allowed.
To set an amount of time for each day, tap Customize Days, then set limits for specific days.
5. When you finish setting limits, tap Add.
To temporarily turn off all app limits, tap App Limits on the App Limits screen. To temporarily turn off a time limit for a specific category, tap the category, then turn off App Limit.
To remove a time limit for a category, tap the category, then tap Delete Limit.
Hope that helps.
Take care.