The recipe of a furnace is 8 cobble surrounding an empty slot
The recipe of a power cube from Calculator is 8 cobble surrounding a furnace
I crafted 4 furnaces, put it into the network, and then set the recipe of crafting power cubes with JEI, shift clicking and it gave me 20 power cubes, which it used up all cobblestone in my system, but only 4 should be crafted.

This is over-crafting, and I hope you fix this problem as soon as possible since it's quite annoying to normal click crafting. Thanks!

Thanks!