Dynamic Table Sum Not Calculating on Commit

I am using the below code to sum a dynamic table.  Each time I add a second "Table1.Row1" row, and select the value that would render countU ==0 true, the Livecycle form will not re-calcuate the query correctly unless I re-select the first row "Table1.Row1" countU value.  In other words, the dynamic table has two levels of expansion.  When I try to add more row under each primary row, the calculation does not automatically run.  Any suggestions?  Thanks in advance!

var sumD = 0;
var countS = this.resolveNodes("TableA.Row1[*].Subform2[*].Table1.Row1[*].MBRS");
var countT = this.resolveNodes("TableA.Row1[*].Subform2[*].Table1.Row1[*].NON");
var countU = this.resolveNodes("TableA.Row1[*].Subform2[*].Table1.Row1[*].CLC");
for (var i = 0; i < countS.length; i++)
 {
if(countU.item(i).rawValue==0)
{
sumD += (countS.item(i).rawValue * countT.item(i).rawValue);
}
}
sumD