I can easily understand these statistics. Modern liberalism embraces unlimited abortion, confiscation of private property, homosexuality, all sorts of social experimentation, a welfare state, and many other philosophies that are abhorrent to the Mormon philosophies of industry, traditional morality, and personal responsibility. Mormons have always been "classically liberal" in our beliefs in limited government and maximized personal liberty.
Main problem with liberals is they are too liberal they want a society where everyone just does what they want without any consequence like abortion so its easy to understand why we're mostly conservative.