Not working with multiple instances?

[Daijobou]

With only one select2-sortable all working fine, but with two and more all have the same order after submit form. :(

EDIT: If I only change position all have the same order. With add new entries its working, but order is often wrong.

Here a alternative: http://joevanderjagt.com/better-multiple-select-with-sorting/

EDIT: The "alternative" have bugs too. Its not sorting new added elements, only when you use drag&drop for sorting its works.