You are going to have to contact your HR/payroll people and ask them what they meant. Why did they put two sets of numbers in box 19?
Box 20 is the name of the locality (usually city/county/school district), so how much of your tax dollars did they send to that locality? Was it the sum of those two numbers, which they split apart on the W-2 for some unknown reason? If so, you can just delete the second line of boxes 18/19/20, and enter the sum of the two numbers in the one box 19.
But I am just guessing - ask your HR/payroll people.