When enchanting an item that you have two of in your inventory (i.e. two swords, two books, etc.) the enchantment does not always apply to the item added to the enchanting table. For example: with 2 normal items and I enchant one of those items it'll get the enchantment; but then enchanting the 2nd item only gives the first enchanted item the enchantments that the 2nd item should have received.
Linked issues
duplicates 1
relates to 1
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Please comment any further information on this ticket: MCPE-10281. Thanks!
From G+ user Joseph Mazelin:
Not much to prove it, but I enchanted this iron axe with Unbreaking 2 and once I collected it, it took my experience and lapis Lazuli but didn't give me an enchantment. I had another iron axe in my inventory that wasn't enchanted and on that was with Sharpness 1, Efficiency 2, and Unbreaking 1.
Minecraft 0.12.1
Samsung Galaxy Tab 4 10.1
Android Lolipop 5.0.2