It's called a Dutch Tilt...when a camera is tilted to the left or right

For the Earth, there are many theories, but the one that is accepted is that millions of years ago a meteorite hit the earth at an angle, causing it to tilt. It is also possible that the moon was formed by the debris that shot out of the earth when the meteorite hit it.

earth can not tilt it is a sphere and they do not tilt

Callisto does not have a tilt. It's axial tilt is zero.

yes it is supposed to tilt