Furnace Eats Wood At 5/1 Split.

I had just farmed 2 stacks of wood and some sulfur/metal nodes. When I  got back to my base, I  went to go put the sulfur and metal in furnaces. They were already cooking at a 5/1 split (I don't use wood normally because VIP). When I  went to add the sulfur and metal, it still deducted the wood, but the wood was never deposited. So a full stack+ of wood is gone.  

This happened on Scourge US.