Drop method triggering issue

[max-min-max]

drop method； Why is it executed twice when dragging is completed

[mfuu]

If the drop list is different from the start, both lists are triggered once.

[pu-raihan]

drop method； Why is it executed twice when dragging is completed

You can actually check the event.oldIndex and event.newIndex.
the list from which the item is dragged will be having event.newIndex = -1, and list which the item is dragged to will have event.oldIndex =-1