How do I fix a persistent scheduled downtime glitch on iPhone?

Go to Settings > Screen Time > Turn Off Screen Time. This disables all restrictions. After restarting, you can re-enable Screen Time and set Downtime again.

Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.

1. Restart the device. That's it.
2. Still not solved --> Force restart iPhone - Apple Support

"Mine is still doing exactly this, no matter what I do. Video of glitch on YouTube . I cannot ‘open’ the scheduled section and it won’t let me edit it, so everyday it turns itself on again."

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Persisten Downtome Glitch:

A. Force Restart:

So, have you preformed a Force Restart? Go Here: Force restart iPhone - Apple Support

B. Update your iPhone:

What is the iOS version installed on your Mac? Go to: Settings > General > About. If not iOS 26.4, I'd encourage you to do so. Then, once installed backup your iPhone to a computer (Mac or PC). You may vis able to update ua Cellular or through your computer. See my User Tips:

• Update your iPhone Using a Computer - User Tip
• Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip

Check if the focus is getting enabled automatically. --> Unveiling the Multi-Faceted Triggers of DND Automatic… - Apple Community

“I’m on iPhone 12 Pro Max, iOS 26.4.”

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Thanks for the clarification.

Then, an iOS update would not apply, in the case. But, keep those User Tips for reference, if not familiar with updating use a computer or through cellular.

Mine is still doing exactly this, no matter what I do. Video of glitch on YouTube

I cannot ‘open’ the scheduled section and it won’t let me edit it, so everyday it turns itself on again.

I’m on iPhone 12 Pro Max, iOS 26.4.