My Tito’s Vodka and Jose Cuervo Silver both froze in the freezer.

About two days ago I bought a bottle of Jim Beam bourbon, Jose Cuervo silver and Tito’s vodka. I put them all in the freezer (Ikik don’t put the bourbon in the freezer) and when I looked today most of both the tequila and vodka froze (not slush), the bourbon stayed completely liquid. Does anyone know what the deal is?