u/HMacME

i tried to put a book with efficiency 2 on it onto a plain diamond pickaxe on an anvil, but it wouldnt let me. i tried enchanting it first with efficiency one on an enchanting table and tried again but when i tried combining the efficiency 2 book and the newly enchanted pickaxe, it just gave me an efficiency 1 book which really confused me.
is there something im doing wrong?

Im considering preordering dungeons 2 but i have a problem.
I want the two alex and steve skins because they look cool but i also want the dlcs upon release, if i bought the deluxe edition would i only get those four hero skins + the other stuff or would i still get alex and steve?
I know it says FOUR hero skins but im just wondering

EDIT: thanks guys, just checked the minecraft website and yeah i still get the two skins