I think I found the problem, in small print at the top of the page: https://ctg-apps.intuitcdn.net/browserclient/8.6.54/L2bkqv2bR
This is not well done from a usability standpoint. It's probably going to cost people money. I'm sure I'm not the only person who received 3 1098s and entered each one, instead of adding them together as described in this side note.
