Just found this thread when trying to figure out the best workflow for entering my stacks of unsorted cards (divided by sets). Unfortunately, I don't even think I noticed this until I'd entered hundreds of cards.
For now, I guess I need to scroll through the confirmation to catch when there's a double row, then increase the count for the first row.
Ideally I enter cards as I rip them, to reduce the number of dupes, but I don't always have the time.
Does anybody else have any recommendations for the most efficient way they load cards into their collections?