When emptying a cooking pot, the pot shows the original meal but with a count of zero. This wouldn't normally be a problem unless if you are transferring to a crock and double right click. The first click transfers the food, and the second one transfers the food again but with a value of zero. This essentially deletes the meal. Pots should either show as empty the first time you empty them (instead of the same food, but zero left), or a lower count of a food should be unable to overwrite a higher one.