What I was especting to happen :

When you unlock some recipes, they take a strange place in furnaces and blast furnaces :

Furnaces : I espected smelting redstone ore into redstone dust being with the other ores recipes.

Blast furnaces : Same thing

What actually happened :

Furnaces : I was especting smelting redstone ore into redstone dust to be with the other minerals, like diamond or emerald, instead it was in the blocks category with glass or terracotta.

Blast furnaces : Redstone has its own tab.

Steps to do it :

-Unlock all recipes or get a redstone ore, any other ore to compare and a block of sand or colored terracotta to compare

-Open a furnace or a blast furnace

-Open the recipes book

-Find out that redstone ore takes a strange place