Photo Shuffle wallpaper restarts if you change wallpaper

Hello MaxPower_,

We'd recommend creating a new Lock Screen with the Photo Shuffle wallpaper to test this out further. Here's how you could accomplish that: Personalize your iPhone Lock Screen - Apple Support

Create a custom Lock Screen

1. Touch and hold the Lock Screen until the Customize button appears at the bottom of the screen.

If the Customize button doesn’t appear, touch and hold the Lock Screen again, then enter your passcode.

2. Tap  at the bottom of the screen.

The Lock Screen wallpaper gallery appears.

3. Tap one of the wallpaper options to select it as your Lock Screen.

For some wallpaper choices, you can swipe left or right to try different color filters, patterns, and fonts that complement each other.

4. Tap Add, then do one of the following:

- Choose whether to use the wallpaper on both the Lock Screen and Home Screen: Tap Set as Wallpaper Pair.

- Make further changes to the Home Screen: Tap Customize Home Screen. Tap a color to change the wallpaper color, tap  to use a custom photo, or select Blur to blur the wallpaper so the apps stand out.

Does this only happen with a specific Photo Shuffle Lock Screen or both of them? If it only happens with the previous one set up, then you'd want to customize the new one to continue using that moving forward. Otherwise, we'd recommend contacting Apple directly: Apple Support

They'll need to take it from here.

Wishing you well, take care.