In the end city loot chests I found a few diamond helmets that had the auto smelt enchantment on it. If I try to enchant my armor, this enchantment also comes up. Putting it on armor with an enchanted book also works. All of this shouldn't be possible.

Minecraft Version 1.9.4
Forge Version 12.17.0.1936
EnderCore Version 0.4.0.21-alpha

XP Boost is also showing up for armor enchants.