When attempting to add or change devices in a group, as I scroll through the list of devices, devices “uncheck” as they move off the screen and I can not update groups. This may be a symptom of my child leveraging a tool to change their MAC address on their device to circumvent the controls. But now I can no longer successfully edit any groups.
Sorry for the issues you're having with your device groups. I know it can be frustrating to have issues managing network settings and preferences when they won't work. Let's see what's going on and how to fix this.
I do have a couple of questions that might help us narrow things down.
I know it's a bit to check, but it should help us figure out if this is a device or an app issue. I look forward to hearing back from you.