Problem with transporting in and out of buffer


I am trying to transport a product using an overhead crane from a conveyor to a buffer, and then from the buffer onto another conveyor, still using the overhead crane. I would like the products to be stored in the buffer for some time, so I tried using the Warehouse Process Shelf, but I seem to have a problem transporting the products out of the buffer.

The products enter the buffer, but they all seem to stay in the same place, overlapping each other and they don’t get transported out either. Anyone know what I might be doing wrong?

I am having the exact same problem! Have you found any solution?