It's the design of the stuffer. They way they use a 90* elbow off the bottom is different that the way the LEM and other stuffers do it. I have a Northern Tool 5lb stuffer thats about 11 years old and this is what I have left over in the bottom of mine (basically it's the same as the old nylon gear LEM model). The stuffer tube is off the side at the bottom instead of in a 90* like the Hakka.
Just enough meat left between the bottom of the stuffer body and whats in the snack stick tube to make a "cooks treat" fried patty about the size of a breakfast sausage.