Taking the resource example Uranium Ingot, let's say I have about 2000 Uranium Ingot in the Refined Storage system. I crafted the Block of uranium recipe by hand. As a result, 9 Uranium Ingots create 1 Block of uranium, but the actual data only consumes 1 Uranium Ingot, and if you continue to craft like that, naturally the Uranium Ingots in the inventory will automatically be left with about 400-600 Uranium Ingot. The remaining Uranium Ingot can still be used, but they do not auto-refill in the crafting slot. As a result, from 2000 Uranium Ingot I made about 1400-1500 Block of uranium and had about 500 Uranium Ingot left over. This affects many different types of resources such as Fluorite...
Prepare:

Result - the amount of uranium block is 1535: