It’s left-wing politics with a right-wing branch that still acts as left-wingers. Thus Sanford University’s statement that liberalism is not right-wing, regardless of the faction. Debate it all you like, that remains fact.
If you study liberalism enough, you’ll see that their statement is factual. Actions speak louder than words, and it is the actions od libertarians, left or right factions, that group them all as left-wingers. You can say all you like that you are this or that, as libertarians love to do, but that does not change what you do and what you take action against.