Reinforcing with stone can consume two blocks instead of one

[wingzero54]

It only happens with stone because it is both a reinforcement and a placeable block. If you are reinforcing with stone, and you are placing from a stack which is not the first stack in your hotbar - you will place a stone block from your stack, and citadel will remove two blocks from the first stone stack for reinforcement. So instead of using 2 stone, it uses 3 stone.

To replicate - have multiple stacks of stone in your hotbar. Setup /ctf and place stone reinforced stone, while using any stone stack that is not the first stone stack on your hotbar.