Microsoft Access Question

I am attempting to build a report in Microsoft Access 2007 and am having a problem. The report is supposed to consist of 1 main set of fields along with 3 sub-reports. I can add the first two sub-reports with no problems. The text is displayed perfectly and re-sizes to fit the data. Unfortunately, when I add the third sub-report, the report data overlaps the 2nd sub-report and doesn't get automatically pushed below the 2nd sub-report.

I have tried generating the sub-reports from queries and other pre-formatted reports to no avail. Any assistance would be greatly appreciated.