IRS Contribution Worksheet line 14

All of mine and my spouse's IRA contribution is non-deductible.  I've entered the same numbers on lines 9, 13, and 14.  I'm getting an error message that line 14 should not be more than 0.  

 

Line 14 seems to be duplicative of line 13; both ask for amount of non-deductible traditional IRA contributions.  Why am I getting the error message?