UnderlayNext problem: Only part of the group header printed

I have a report that has two headers. On the top one I have a subreport on the right side, that shows the report’s main data. On the header below, I have two subreports. The one on the left has tabular information while the one on the right has more form-type info. This last subreport is set to match the upper header report size and position on the page.
Now, the top header is set as UnderlayNext = true, so it gets printed side by side with the tabular report. All is well except when the footer section of the subreport on the left does not fit on the page it is supposed to be printed and is moved to the next page. When that happens, the upper header section only gets partially printed, with the same height as the footer section of the other report.
Attached are images of what I mean. The whitesmoke colored section is the top groupheader section.