You saw it right. Trump runs the worst of the top 4 Republican candidates against Hillary:
Trump vs. Clinton NBC/WSJ Clinton 50, Trump 40 Clinton +10
Cruz vs. Clinton NBC/WSJ Clinton 48, Cruz 45 Clinton +3
Rubio vs. Clinton NBC/WSJ Rubio 48, Clinton 45 Rubio +3
Carson vs. Clinton NBC/WSJ Carson 47, Clinton 46 Carson +1
They musta got the gopE memo.