Sub-report positioning

I am developing a report that has two sub-reports. One is positioned at the top of the page and the second is positioned half way down the page. The two sub-reports show the same information. When the report loads the first page is rendered correctly. First sub-report at the top of the page and the second sub-report at the middle of the page. All pages after that, the second sub-report is over top of the first report at the top of the page.

I have the two sub-reports in the same detail pane. When I add a second detail pane, I get just one sub-report per page.