Prevent the groupfield from repeating every three rows

Question

I have a web app and I need to integrate some JasperReports in this app.

So I downloaded iReport and I used the templates. I choose the LeafGreen template, but I have a problem.

When I have more than 4 elemets in my list, my headers gets repeated every 4 elements (see the image:) - I don't want this; once is enough.

The problem: i39.tinypic.com/9kcp6p.jpg

This is the template: i44.tinypic.com/2ags1w1.jpg

What I'm doing wrong?

LE: Here is the file: http://www.filefront.com/16244947/jasper.jrxml/ Note that in the picture I changed the names of the elements to a.