Justice Dept. provided faulty info. to Supreme Court

In the U.S. Supreme Court's Nken v. Holder (2009) case, the U.S. Justice Dept. admitted it submitted faulty information to the Court.  The Justice Dept. suggested to the Court that not do anything about it. This isn't the first time this has happened in U.S.  history. Sloppiness or deliberate falsifying?  Are there too many political hacks in the Justice Dept., and not enough serious lawyers?  What will the Court do about it?