I don't think anyone ever considered Utah to be libertarian...it's very socially conservative. Maybe you were thinking of Wyoming?
Utah is very moralistic and socially conservative, but recently there have been a bunch of news stories about Mormon moms with kids that have painful disorders or illnesses (like epilepsy) that need to get medicinal marijuana to ease their kids pain/upset digestive systems. Specifically, a couple of Utah lawmakers have promoted a individual strain of marijuana that's strong enough to help the kids, but not enough to get them high.
Utah is in no way libertarian.