Jasperreports adds collapsed column at end of Excel report

See picture, all our reports gets an extra colapsed column at end of report.

I've tried all the tricks in the book to remove them:

• net.sf.jasperreports.export.xls.remove.empty.space.between.columns
• Aligning all cells so that there wil be no empty spaces
• Deleting all template elements, narrowing it down to just a clean master report with just a subreport, containing the detail band

Also tried printing just an completly empty report, and that generates empty sheet with 3 colapsed colums at first (A,B,C)