In the Active Roles Web Interface Views, it is possible to add additional columns temporarily by choosing the Menu | Choose Columns... option.
These columns are not present in an export when choosing the Menu | Save to file... option. This same result occurs when accessing a Personal saved view. The columns in the current view of the screen are not included in the exported CSV file.
This is by design.
An Enhancement Request ID: 100760 has been created so that an export of a View retains the included columns.
Delete and recreate the View with the desired columns in place before it is exported.