Restricted web content visible.

Hi, I’ve recently set my 8 year old an account on the family Mac. I have set up restrictions within screentime including only allowing access to the websites I choose. Every few days however, the website restrictions disappear. They are still shown as active in the screen time settings but when on safari I can access any webpage I like. And I mean ANY. I have to turn screen time off and on again to reset safari to allowed websites only. Is this a potential bug? It’s obviously not very safe as a parental filter. No, he does not know the code needed to unlock. Any help would be appreciated. Using Catalina on a late 2012 27 inch iMac. Thanks.