If you create a list from the "More" menu the box to add a new barcode is under the list. This means that each time you add an item the page redraws and shows the top of the list. Then you have to scroll all the way down to the bottom to add the next barcode, then you have to scroll all the way down to the bottom to add the next barcode, etc. If the box where you enter the barcode was above the list, then when the display redrew, the box would be right in front of you and you wouldn't have to scroll.
This is fixed in 16.05. *** This bug has been marked as a duplicate of bug 11325 ***