Spamm clicking to craft items with recipe book don't show the numbers of the crafted items.

When i was crafting an item (pistons) i spammed to put the blocks faster, that way it broke the number and it appeared as 1 item. 

How to recreate: 1st get 64 items of the crafting you want. 2nd find the item you want to craft in recipe book. 3rd spam click on the item.