See my comment below to the recommended answer, this appears to be an issue on the IRS side related to their auto-processing software for e-filed returns:
<a rel="nofollow" target="_blank" href="
https://webcache.googleusercontent.com/search?q=cache:ZIurjNAOqcQJ:https://www.irs.gov/pub/irs-schem...>
(line 126)
