Rather than utilizing the Reports tab, use the 'Export Users' function in the Users tab.
In order to view which users belong in each hierarchy folder, click on the Users tab and click the "EXPORT USERS" link. This will send all of your user data, including hierarchy information, into an Excel file. The Hierarchy ID is in column AB.
For more Hierarchy information, click the Hierarchy tab from the Users page, and then the 'EXPORT HIERARCHY' link. This spreadsheet contains the Hierarchy IDs, Folder Name (node), Parent Folder ID, Level, and email recipient information.