I encountered the artifact that the same group header is printed twice at the beginning of a new page.
I have attached an example report, a screenshot of the occurance in Jaspersoft Studio and the CSV file referenced by the data adapter.
I suspect that this is caused by the combination of the group properties "Reprint Header on Each Page" and "Minimum Details To Start From Top".
Attachments:
duplicategroupheader.jrxml
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