Downtime kicked on by itself!

I have been using screen time on my iPhone to discipline myself. I have it set up where downtime comes on at a certain time and goes off at a certain time. I wasn't using my phone this morning, and around 11:00 A.M. it said "Downtime: screen time will be limited until tomorrow at 11:00 A.M." So it just timed itself out for 24 whole hours? What is going on? I did not set it up to do this! I could go into settings and just turn screen time off, but would that be temporary or permanent? I don't want to have to set it up again, and I also don't want to have to go tap on "ignore limit" on every single app either!