Jasper Reports Excel Output Problems
Every single time I had problems with that it was because the fields weren't properly aligned. So make sure the fields that should be vertically aligned have the same x value and have the same widths.
Your first Data field is located at x=1 (the other fields on that column are at x=0). Maybe this alone won't solve all the problems, but I am pretty sure the first Data will start to appear in the Excel output.