Somthing is not quite right

This is from an article on MSN. One question - see the bold type - why the disparity?

LITTLE ROCK, Ark. - Arkansas' marriage-age crisis is over. A law that mistakenly allowed anyone — even toddlers — to marry with parental permission was repealed by a measure signed Wednesday by Gov. Mike Beebe, ending months of embarrassment for the state and confusion for county clerks.

Lawmakers didn't realize until after the end of last year's regular session that a law they approved, intended to establish 18 as the minimum age for marriage, instead removed the minimum age to marry entirely. An extraneous "not" in the bill allowed anyone who was not pregnant to marry at any age with permission.

The bill read: "In order for a person who is younger than eighteen (18) years of age and who is not pregnant to obtain a marriage license, the person must provide the county clerk with evidence of parental consent to the marriage."

Legislators, however, had the chance for a do-over this week when Beebe convened a special session to consider a hike in the state's severance tax on natural gas. They repealed the botched law, and reinstated 17 as the minimum age to marry for boys and 16 for girls.

Rep. Will Bond, the sponsor of the botched 2007 law and its correction, apologized for the error and asked his colleagues to "throw me a rope and bail me out here."