Starting up Minecraft today, I noticed that the furnaces I had left running were not showing any flames. When checking all eight furnaces the fuel (charcoal) was missing. The sand was still in the top slot, and some glass was showing in the production item slot, but nothing in fuel slot. Figuring it was just a glitch possibly cause by an update, I put more charcoal in each furnace, each lit up, then I went outside, built a pasture, and got some sheep in it. Going back inside and checking the furnaces, all the fuel was gone again! I'm using plain vanilla Minecraft, no mods.
Mine was doing almost the same thing. I kept trying to get things to cook in the furnace, and then it just started working fine. I have no explanation for it at all!
Any help, please?