The problem involves placing Draggables inside a fixed-height, scrollable div. When a Draggable is dragged out of the div and either dropped into a Droppable or reverted back into the div, they gain a fixed position inside the scrollable, rather than a scrolling one.

This means that when the div is scrolled by the user, they always see the dragged Draggables in there in exactly the same place, while the rest of the div scrolls underneath them. A "hole" is left in the div where the Draggable was.