From a skeleton farm I have, I got multiple chain armor drops that I repaired, and enchanted. I then enchanted a book and tried to add it onto my chain boots, but if I enchant it, I use the xp and don't get the new enchant. It does this for all chain armor and all enchantments.
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Windows 7, Java v7 Update 15
Duplicate of MC-1907.
OS and Java version would be extremely helpful!