Using 3.2.1, I tried this code and it displayed what I would expect to see with first line in the output window showing 123.123 and the second line showing the entry above it.
private void button1_Click(object sender, System.EventArgs e)
{
this.gridDataBoundGrid1[2,3].CellValue = 123.123;
Console.WriteLine(this.gridDataBoundGrid1[2,3].CellValue);
Console.WriteLine(this.gridDataBoundGrid1[1,3].CellValue);
}
Are you using an hierarchical GridDataBoundGrid? If so, there are extra header rows for each levels that you would have to take into account.
Can you upload a little sample showing the problem you are having, or tell us how to see the problem in one of our samples?