Even though I am a former English teacher, frankly I didn't notice this error. As folks have said, so many people from the U.S. (native speakers and writers) don't know proper grammar any more, and we're having more and more immigrants who struggle with English as a second language. Alas, I seem to be getting a bit more tolerant. Cringe.

One of the items did floor me, though. I seem to recall it had to do with children, and I really didn't know how to answer it. I think the choices didn't provide me with the exact circumstances of my life--maybe something such as "Do you have children at home?" I have children, but they are grown..... I couldn't figure out what issue this question was trying to address either.