If you find that you have a duplicate or even a triplicate of a property inside the Export List you can do the following to remove one (or more copies).
- On the far right of the property click on "Edit".
- On the right-hand side look for the option that says "Processed", which is default to "No". Change that to "Yes".
- Click on "Save & close".
Once that is done you can go back into the Export List, search for the property and the search will show only one result.
Below, please see a short clip of the above explanation: