Restrictions keep being changed on my two daughters' iPhones
We have Family Sharing set up, and I've always been able to control my daughters' phones via this, for example setting screen time and app limits and being able to see where they are via Find My (they didn't know about the Find My but were aware of the other restrictions). This weekend they are with their father and seem to have managed to change settings, despite me having screen time passcodes set up (which I've since changed twice today just on the off chance they had guessed them or knew them).
The things that keep getting changed are:
Location Sharing > Block changes keeps getting toggled off
Screen Time > Content & Privacy Restrictions > Share My Location keeps getting toggled to 'Don't Allow'
How are they doing this when I have 'Don't Allow' selected for Passcode Changes, Account Changes and Mobile Data Changes toggled on?
I have tried so many things including signing out of my iCloud account etc. but it keeps happening.
Advice appreciated!
iPhone 13