Every enchantment table I go to in /server factions' spawn, has lapiz in it. It's a little annoying, and I don't know if it's useable with an item in it. I can't table the lapiz out any of the enchantment tables.
I'm sure it has something to do with the server not fully being 1.8. I'm not sure if this is fixable, so try to ignore it
Don't use 1.8 with factions until they fully update it, the enchanting is all messed up due to your client being 1.8 but the server still being 2.7.10
It's a glitch like what people said above. It doesn't affect your gameplay at all. Just makes it look somewhat 'advanced' :3. BTW, you can still enchant with that, I do that all the time.
It does indeed have something to do in the 1.8 updates: Retrieved from source I think the server sticks the lapis in there as a way of disabling players from using the new feature. As the server is 1.7/1.8, what can't be done on 1.7, can't be done on the server due to compatibility. i also have a little video on my channel about it if you must see.