Books disappear when Enchanting with Number Keys

When I was enchanting a large quantity of books, I simply pressed the number button that related to the correct spot on my hotbar.

What I expected...
One book out of the stack would get taken out and put into the enchanting slot, making it easy to enchant lots of books.

*What happened..."
The entire stack was taken out of my hotbar, but only one book was in placed into the enchanting menu.

The effect...
I lost an 63 books out of the stack! I know they are cheap, but I didn't like for them vanishing into thin air!

Afflicts...
All gamemodes, and in all recent versions. Please fix, I had so many books...