Description of the Issue
This might be by design.
If you put 1 unit of Wax into the bottom box of the Incinerator, it will burn 10 items in the top box, and make 10 units of Ash. Wax will process 2.5 units of Copper in the Furnace.
Describe what you were doing when the bug occurred.
Can you reproduce the bug? Can you cause it to happen again?
Save File, Logs
You can access your save file through the load panel.
A tutorial is here: How to Create a Bug Report