The report item's KeepTogether property is set to True and if the item (Table) can't fit on the current page, the report engine tries to render it on the next page. Thus a Page Break occurs. If the report item don't fit on the next page the report engine turns off the KeepTogether option.
For your scenario our suggestion is to set the KeepTogether to False on all items that you want to split.
the Telerik team