I suspect that is listed there..just to let you know how you set your withholding level at your employer. Your pay allowances do not have to match your tax return exemptions...those numbers only set how much the employer withholds during the year. Lower numbers result in higher tax withholding
If you end up owing the IRS or state when you finish preparing and filing your tax return...then you need to lower your allowances for 2018.
If you come out fairly even or get a refund...then it's OK