Thank you!
What I did not realize was that in the Box 12 entries, you can scroll down. The way the form is designed (at least in the Mac version), only 4 rows are visible at a time, with no clear indication that it's scrollable. So this isn't a functionality issue, but I'd call this a bit of a UX issue.
I'm glad that your response triggered me to consider whether this section within the W-2 page can scroll.
