Hi there lolamarie106,
Thanks for joining us in Apple Support Communities! We understand Do Not Disturb is not turning off as scheduled on your iPhone. We're glad you're here, and we'd like to learn more to see how we can help.
To begin, have you updated to iOS 15.1 yet? You can check by going to Settings > General > About. Learn more about updating here:
Update your iPhone, iPad, or iPod touch
If the issue persists after updating, let's take a closer look at your schedule for Do Not Disturb to be sure the correct days and times appear. This support article will walk you through it:
Use Do Not Disturb on your iPhone, iPad, and iPod touch
Let us know what you find.
Cheers.