I see that they did not teach you how to do your sums in Alabama. 1+1+1+1+1+1 under the free whites category is equal to 6 persons. 2+1+2+2 under slaves is equal to 7 persons. 6+7=13 not 18 as you somehow calculated.
You obviously need this wonderful invention that we have invented since you first enumerated the persons in your area to calculate your totals. It is called a spreadsheet program. You can choose from several. There is Microsoft Excel, Corel Quattro Pro, Open Office Calc, Lotus 1-2-3, and even Google Docs. If you put in the correct formula, it is very easy to calculate the totals so that you are not off by 5 persons!
Someone in the 21st century who is using your data