So learning an Outlaw page is bugged and you can't craft the item. I attached 2 photos, one with the crafting UI where I have the style material and the next is the achievement progress with swords unlocked.
Crafting
If you know more than 20 crafting styles, the crafting UI will make it appear as though you have forgotten some styles. This is just a UI issue, and will be fixed with a future incremental patch.