Fuel burning too fast when smelting

When I logged into Minecraft. I smelting some iron with coal. When I placed the coal it smelted the iron but the coal fire in the furnace finished before a iron ingot was smelted. I was confused. Then I tried a lava bucket because I thought it was an update. I placed the lava and the fire animation in the furnace finished real quickly also. The lava was able to cook only one pork chop. It's supposed to cook 64 items but it barely cooked my pork chop. So then so realized it was bug. I lose my bucket and now I gotta waste 3 iron ingots. If anyone has had it then also report it cuz it’s smelting is broken. Can’t smelt iron with coal, wood, lava, or bamboo because it only cooks one item.