Hopper Transfer Order is Broken

When item stacks are transferred to chests via vertical hoppers they will split the items between the top and bottom chests instead of sending all to bottom.

How to Recreate:

1) Place chests & hoppers as in pictures.

2) Use Water streams and dispensers to transport large volumes of items to top hopper.

3) Watch the hoppers split the stack(s) between top and bottom chests.