Rules didn't work on kids Android phones

Hi,
the rules I applied seems to work.
After a while I and my wife have a feeling something goes bad because our kids pass too much time with their Android phones.
If I check the rules on phones, they seem to be applied correctly. As soon as I force them from phone, the rules begin to work fine again.

Could you help me to understand best way to use your product and troubleshoot the issue?

Thanks a lot.