After dying the shulker boxes it deletes the items in it

If we made a shulker  box and put items in it and dye the shulker box with the items in it and put the dyeid shulker box on the ground it duplicates it and when we punch on the duplicated shulker box it disappears and when we put the original shulker box  on the ground it deletes the items in it so please fix this bug☺