Crafting skills split into many branches, but you skill get the craft action of your highest achieved lvl in that branch. For example if your earring crafting is lvl 190 you can craft q200 earrings. You can use the same q200 action to make anklets even if your anklets are at q150. The difference is overcrafting and gives additional xp because it is more difficult to make q200 if your skill is only lvl 150.
