1. If the report generator option Remove Stray Objects is unchecked. This option deletes unused/orphan objects from the report.
2. The routine removing stray objects needs to be improved to detect cases of cicrular linking. For instance, a picture may have a place, and a place may include that picture. In this case, both objects are considered "in use" although both the source and the picture have no real references anywhere.
As a temporary solution, you are welcome to use the Table Layout and delete the places you don't want. Just right-click with the mouse and select "Delete Place" to delete the selected place.