I have a problem in my code which also is reproducible in the demo code of the sortable, "connect lists" link.

I do the following:
1) Drag item 5 of the right column (yellow colored item) vertically down for approx. 1 inch (not so far as to touch the border of the demo)
2) Move it to the left, so that it is aligned with the left column
3) Release

Expected behaviour: Item joins the left column.

Observed behaviour: Item joins the right column.

Any workaround ?