Has Station Vodka??..

I’m not typically a vodka drinker. I opt for tequila. However, I was running to a gas station and saw they had Svedka, blue top double shots. I got two. When I got home, I put them in the freezer. My fridge is new and I’ve just moved on a short bit ago.. the vodka turned into slush… I’ve never experienced this before and it has me wondering if it’s real or not??… I really wanted this shot but I’d love if someone can tell me if this is normal or not. It didn’t freeze completely, but it did form slush like after.