Specifically I am using the Northwind test database with example data and Desktop Manager v20.8.25 and Manager Server v20.8.40.
If I run the Profit & Loss report (same thing happens for other built in reports)
and drill down on the Inventory Costs shown highlighted above (but it happens of all drill downs if applicable)
Notice that column headings, specifically it only has Debit column. If I click the export button on the bottom of the page, I get all three pages of data, but only with the column heading shown. (e.g. NO CREDIT Column)
If I hit the next page until I get to page 3 or 3, you will notice that the Header has changed as there are now Credit items to display.
If I now select the Export button on the bottom of the page, I now get the correct data being exported.
This is a bug, because If you export on the wrong page, you will not get all the data you think you will get but may not be aware of it.