Bedtimes (time zone?) keeps changing

I can tell people had this problem before but I never found an answer on the forum. My xFi app bedtime settings used to work fine. Tonight the bedtimes keep changing- even in front of my eyes! The whole sleep time shifts several hours later, for weekdays and weekends, suddenly, for all users. When I went from one kids profile to the next I saw my original settings then saw them change in front of my eyes. My kids aren’t doing it. I think it’s a time zone issue. Because when I logged off and then logged back in and then changed them to what I wanted they suddenly changed to several hours earlier and paused the devices now, before I wanted to. Please help. The bedtime feature is important to me. Thank you.