Lava Fuel in Furnace

Hi, I want to report bug!!! When you use lava in bucket like Fuel in Furnace, and when you teleport to the spawn or somewhere, then you go back to home, at your Furnace Fuel level is stuck, and it is always at 100% (MAX LEVEL) I don't know is it glitch on Bukkit Server, but maybe it is to Minecraft... I hope you understand me!