I was just running around looking for some stone (way too rare) and I needed to eat and drink. I ate a couple of pieces of meat, but when I tried to drink, it wouldn't let me. My character just swung a punch. As I kept clicking, he kept throwing punches and my stack of meat broke in half and spread to the next slot. My meat was keyed to 4 and my water to 3.
I now have 1 piece of meat on my hotbar I can't eat and can't drink. I'm abut to restart my client, but I thought I'd point this out.