I'm not sure if it's a bug or it's intentional, but in Goldpact Knight's ability tree you can see "Zelous Aura" and it's upgraded version, while Goldpact Knight is unable to learn paladin auras. In game while leveling character it works as it should so player can't pick "Zelous Aura", but it is still misleading to show this ability in ability tree. Imho "Zelous Aura" and it's upgrade should be removed from Goldpact Knight's ability tree if it's possible.
I guess it's intentional because all ability trees are class specific with addition of passive/active for chosen subclass, that's why on the screen above it's stated "Paladin" in upper-left corner instead of Goldpact Knights... But still - misleading.