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Adding works fine nm...lol
I don't think we can help unless you include more information. I assume this is a table, but you don't really say. You don't provide any information on how the calculations are done other than to say that there is an n/144 division used, but adding does not generally include division factors. All data in the table is expressed as square feet so no conversion from square inches would be required. This looks to me like your algorythm is including the 1st Floor A/C when it should not. I'm not sure that is a Bricscad issue.
Ok this was operator error....ugh...