I've had a quick search and couldn't find anything on this although my computer skills are not terribly amazing so that doesn't say much. :-)
I'm a bit of a collector and I'm currently working through enchanting patterns. I have the world drop Enchant: Boots - Cat's Swiftness but my recipe addon still has the drop from Magisters' Terrace showing as available. Is it possible to have both drop for you and to learn both?