This is not a glitch. This is a purposeful design by Microsoft to give people a false sense of security and control. Microsoft’s Family center is without question the WORST family safety/monitoring tool out there. Google being the second worst. By design MS and Google believe that parents don’t have the right to monitor their minor kids or restrict the content that their minor children see.
None of these child safety/monitoring tools are perfect, but the best I’ve seen in a platform is Apple’s as it’s pretty easy to configure and just works.
As for Microsoft, my advice is... choose another platform as anything is better. The Microsoft one is nothing short of useless.