The report is rendered and paged according to the rules described in the following help articles:
The report is divided into pages based on the report's PageSettings, the size of report items and sections and KeepTogether properties of sections/items.
Most of the report items are not kept together by default. If you have a Table/CrossTab item in a subreport, set KeepTogether=False
for this item as by default it is kept together.
Also, test resizing the report sections and items of both master report and subreport and check their KeepTogether properties.
In order to provide you more accurate suggestions, open a support ticket and send us the report definitions so we can check them locally.
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