Dear Richard,
It looks like you have 'Show diagnostic information' option selected.
The utility report has only two columns without it.
Diagnostic information is needed to find out why items are not duplicates mostly.
And it is recommended to copy it (or save) to Microsoft Excel and analyze it there.
If you need to copy duplicates to another folder then you need to download and run another utility:
Removes duplicate messages
There is option an option called 'Move duplicates to folder'.
Please note that 'Delete duplicates permanently' options should not be selected.