iOS 18 Extend Wallpaper keeps self-adjusting

My brand new iPhone 16 Pro on iOS 18 keeps self-adjusting the zoom on many of my lock screen photos that are set on shuffle. The Extend Wallpaper function is on, and my Settings - Accessibility - Zoom is off, per community forum suggestions. However, my app phone will randomly zoom in on my zoomed-out lock screen pictures. Does anyone know how to fix this so I don't have to keep adjusting it every so often? Thank you.