When scheduling a report to be sent to email, the report only has 50 incidents. If they manually do it and send it, it has all the incidents.
This holds true even when logged in as Administrator.
This occurs only in V10, not in previous releases
A change within the product cause that sheduled reports cap maximum incidents to 50. Manually emailing a report does not put this cap.
However, this prevents end customers from sending out reports.
Current workaround would be to send out reports manually or create scheduled reports to contain a link to access the actual report through the UI.