First, check the Setup and Smart Lists for both reports to confirm that they cover the same time frame and group of leads. If the Setup and Smart Lists for the two reports are the same, the data on one of the reports could be from a cached version of the report. Unlike Smart Lists, reports do not re-run every time they are opened, so a report may not be showing the most recent information. Click the refresh button at the bottom of the report to make sure you have the current results.
Reports can be refreshed and reflect the most current data in three ways.
To ensure that the most current data is showing on the report you can click the refresh button before exporting the data.