Screen Time - Tik Tok

Hello Apple Support Community,

I'm trying to use Screen Time to better control my teenagers' iPhone usage. I'm struggling to get Tik Tok under control. I set an App Limit specifically for Tik Tok, but it's clearly not working. When he's being punished I drop the limit to 1 minute daily and then I'll check his activity and see that he used it for more than an hour. Is there something I'm doing wrong? I need to get the social media usage under control. Thanks!

HHM11