So I have been doing a lot of AFK Fishing, looking for some mending books. And now, with 1.14 giving us the Grindstone that can remove enchantments, I've been using that so I can get some more books easily, for future enchantment. However, I've noticed that I have 2 stacks of books, and they won't stack together.
I know I have books from two sources: I have created some in a crafting bench/looting libraries, and some are from unenchanting them.
Is this the case?