My wallpaper is too big with the iOS update. How can I fix this.
Turn off the parallax effect. (Settings > General > Accessibility > Reduce Motion > [ON] )
Set your wallpaper the way your want it.
Turn the parallax effect back on (Settings > General > Accessibility > Reduce Motion > [OFF] )
Some report that turning the parallax effect on after setting wallpaper resets the wallpaper. YMMV
Another option is to take a screenshot of the picture while in the camera roll and use that for the wallpaper. Turning off the parallax effect centers that even better for the wallpaper.