In a LAN world be and my brother have a bug that we can't get rid of, it wasn't always like this in the world. When you try and eat a piece of food or load a crossbow, it plays the animation decreases your hunger for a second and then reverts, no food gets used. After the animation plays about 2-3 times you actually consume the food. Likewise with crossbows, the animation plays an arrow seems to get loaded and then the arrow disappears and it takes 2-3 3 animation cycles to get the arrow loads. 

I don't know what triggered this, we used to be able to eat normally as of the day before (9/24 maybe?).