Screen Time keeps resetting.

I've never had issues with screen time until recently. All my kids devices screen time keeps getting turned off or rest. All phones, iPads have latest iOS update, I’ve tried resetting the devices setting, & changing passwords. But everyday when it’s set to block it’s not happening & I have to set it up all over again. Sometimes I go back 20 min later & it’s turned off again. How can I fix this.