I don't know if this is intended, but if you leave the charcoal forge without any inputs, it starts to consume the coal and generates Granite.
http://prntscr.com/jq002g

Can you check the config option for STONE_DROPS_ROCKS?

I changed it to false.

Ah ok. Those recipes shouldn't of loaded, as they are trying to smelt granite cobblestone, which doesn't exist.

Also, i'm trying to raise the temperature of the forge to try and get Bronze, but even with the bellows+tuyere and spamming right click on a lever, the temperature stays the same.

I'm really interested in using this as a core more for the early game on my pack, so I might be bothering you a lot with suggestions and bug reports, if needed.

Can you post a picture of your setup? I have the forge running fine in my dev environment. Also, bother away! I like hearing what people think. 👍

About my setup, the bellow were wrongly placed, it's working now.

Ahh perfect