Seems that a stack will not go into another stack. This morning I noticed that apples were stackable and so I wanted to stack the 120+ I had. Somehow I ended up with a 2nd stack so I went to put it on the stack I was creating it jumped off the stack and when it landed on the non stacked apples it collected one more real weird like and I never could get it to stack with the bigger one. Its not game breaking but just thought you all should know it may happen with the other new stackables or even some of the old ones.