To reproduce it, steps as follows:

0. Compile and Execute the attached code.
1. Select the first row by clicking on cell with "one".
2. Select 2nd row by clicking on cell with "three", pressing SHIFT key for
   multiple selection.
3. Now perform DnD operation selecting cell containing "three".

Result : You will see only "one" & "three" got transferred to target
         component, even though all the cells are selected.

If you follow these steps :

1. Select the first row by clicking on cell with "one".
2. Select 2nd row by clicking on cell with "four", pressing SHIFT key for
   multiple selection.
3. Now perform DnD operation selecting cell containing "four".

Result : You will see all the selected cells got transferred to target
         component.