I already replied to your question in the support ticket that you submitted.
For convenience I am pasting the reply here so other users that experience same issue may read it.
Thank you for contacting us.
The problem comes from the fact that Kendo Draggable and Kendo DropTarget components are initialized multiple times which is not supported. The code in reference is:
Note that the selectors $(".draggable"), $(".droptarget") will select both the newly added and already appended to the page elements.
Please make sure that only the newly added to the DOM elements should be initialized as Kendo Draggable.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI