I dont prepare 1040NR returns, but I went ahead and opened one and tossed a figure in the Sch NEC under dividends and I see the same thing you do when I Print Preview....it puts it on Line 11, gambling winnings instead of Line 13.

@IntuitAustin   can someone look into this?

Hers what the screen looks like (I couldnt grab the entire page in 1 screen shot, but the bottom lines that are screwy show up) and the bottom one is what the PDF looks like.