Navigate to Reports > Saved Reports > All Saved Reports.
Select the report in question. Check the Date filter. It may have been set up as custom with the date manually entered. Select today in the Date filter to make sure that the As Of Date dynamically changes.
1) Navigate to Reports > Scheduled Reports > Report Schedules.
2) Click the Customize link.
3) Under Choose Filters, Report Filter Date field should have a Value of Before and Including Date Range : today XX/XX/XXXX.
4) Click Save