The Trickster Magic trait from Gnomes of Golarion can not be used (or seen) if the Inner Sea Races source is also loaded. Instead it only shows the Race trait also named Trickster.
Since they have the same name, I bet it's just getting overwritten, and a simple rename is all that's necessary to fix.
Inner Sea Races, Gnomes of Golarion
Added "Gnome" and "Varana" to KEY's of respective traits.