When entering into the GUI for certain furnaces, the smelting animation is above the rest of the GUI. Relogging into the world fixes the glitch only sometimes 2/10 furnaces tested had this issue. Breaking and then replaces the furnaces removed the glitch. Furnaces were made in the nether, using only buckets of lava for smelting.
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Duplicate of MC-10025
Can you explain what you mean? The GUI is always same for me, and I don't see the problem in your screenshot