Item ID lost after drag & drop

Item ID lost after drag & drop

Hello,

I try to create a drag & drop for my website since 4 weeks and I have a prob with the value of an item ID.

I have 2 sortables and 3 droppables in a table.

There is no problem when I drop an item between the 2 sortables. Each time the ID value is OK.

If I drop the item in a droppable, no problem too. Same when I drop Inside all the droppables.

But when I drop from a droppable to a sortable then the ID value is "undefined"

You can see my code here : https://jsfiddle.net/cbh8anuL/12

Please can you help me to find why it doesn't work?

Thanks.