Hi Demiplane,
It seems that the Gnome ancestry gets Darkvision instead of Low-light vision by default.
I just made two test characters, one wizard and one sorcerer, both should by the rules only have access to Low-light vision, but they both get Darkvision instead.
Clicking on the Perception tab on the Character Sheet, it list “Gnome” as source under Darkvision.
Kind regards
Zeepee