Everywhere in the code, it is troubadour as it should be because on the wiki the set is called the Troubadour. The actual pieces of armor are named Troubadour's ____ though.

Evocation Robe Chestplate Slot is called Evocation Robe Chestplate whereas Ember and Verdant Robe Chestplate slots are just called Robe rather than Robe Chestplate

And also thief, same as souldancer and troubadour

Same as troubadour, Souldancer is written as Souldancer's in reference to the items