Some words are also officially recognized with different genders. E.g. it's "der oder das Ketchup". [1] I argued multiple times with my girlfriend that "der Ketchup" doesn't sound right at all, until we looked it up.
My best guess is this comes from different dialects that associate different genders with certain sounds. She comes from Schwaben, while I'm from Franken, which speak very different dialects. I had never heard "der Ketchup" before.