As you may or may not know, there are two ways to cancel crafting queues.
One way is by clicking the X on the right side of your screen next to the item name.
Another way is by right clicking the item in your crafting book. - NEVER DO THIS, BECAUSE WHEN YOU DO, YOU DO NOT GET REFUNDED THE MATERIALS.
Just thought i’d warn you guys before any of you lose a lot of materials due to it. I cancelled 10 metal chestplates before realizing what had happened. XD