Block of Copper in Stonecutter wrong maths

All the craft of Block of copper in the stonecutter is x4

• 1 Block of Copper = 4 Cut Copper Blocks
• 1 Block of Copper = 8 Cut Copper Slabs
• 1 Block of Copper = 4 Cut Copper Stairs

Instead of the craft from Cut Copper Block to Cut Copper Stairs are 1:1 ratio (1:2 ratio for slabs)