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this is an expected behavior, definitely You are concerned about about the time above average, take into account this is referred to devide itself, why in iPad is lower that in iPhone? What if You stop using Your iPhone In a day and use only iPad You will see the average will go down in...
When set up mode do you refer to set up assistance?
Take a look into this article
https://support.apple.com/en-us/HT201274
If your device has a restriction code (screen time) it also tells you what to do