Drag And Drop remove the wrong DOM node

[Akta3d]

In this sample : http://plnkr.co/edit/z8aj7ALiyDVXE6WabObB?p=preview
If you drag the Bloc in index 0 then you drag a product line in the bloc.
The bloc is deleted

I don't succes to see where the bug appear

[Akta3d]

In previous sample : Problem 2 has been solve by SortableJS/Sortable#917

[Akta3d]

I have always the problem of the wrong node deletion: problem 3

I have simplifyied the Plunker to have the minimum of code. Now there is just sortable code
http://plnkr.co/edit/Ot5rWTCqRQYnEyly1nvM?p=preview

And I have a new problem (problem 4), where we have a node duplication