Device is Lumia 928, I had a system error occur when swapping item in a chest, I was booted from the chest and everything was fine. Later I made 2 diamond swords and tried enchanting both. First one was enchanted with Bane of Acropolis and the other was sharpness. It then allowed me to place the Bane sword back on the enchanting table for a second enchantment, I gave it unbreakable and the other sword lost its enchantment, enchanted it again and it wouldn't take the enchantment. I backed out of the table and neither sword was enchanted. I lost all my XP and have no enchanted swords.