Can't Enchant Weapon through enchantment table

I'm making a weapon mod and its pretty important, at least to me, that the weapons can be enchanted. When I put the weapon in the enchantment table it shows the list of enchantments I can select from, but when I click one nothing happens. I can however enchant through book and anvil. For my weapons I'm not using the default enumtoolmaterial, might that be why I'm encountering problems?