I am getting Order Items, from order collection by Order ID but as from the attached screen shot (Order 15) I am getting one product data two times. Can any body explain the reason and what will be its solution as I need it once.
Sparta Gym Tank is configurable product. Check parent_item_id for this item. If parent_item_id is not empty/null then this product is child product.
parent_item_id is the parent configurable product