This bug is the fact that if you have a normal pickaxes etc. .. So you want to fix the Anvil but in a normal 2x2 crafting like I mean in the inventory, well, there you put into it two picks and hold shift and click on the the pickaxe and those picks them create as I mean to the entire inventory than instead that you have only one. I do not know if you've briefing but sorry for my English. Thanks