I have this similar problem, but I know the conditions that cause that bug. I had about 3 hunger bars left. So, I grab my fried chicken and started to eat. While eating, I opened Inventory window (still holding right button on mouse), waited until he eats it, then (still holding right button on mouse xD) closed the inventory and my second chicken was eatten immediately oO. Afterall, I don't need to eat anymore, but later (by later I mean like 20 mins) at some point it starts to lose hunger bar again. Maybe it resolved to normal after restarting the game or so, don't know exactly.
Still in 14w31a