Apex Reports. There is a field called Promoter District. The Phase Due to Start Report has more options than the phase due to complete in the drop down list.
Apex Report will only show data if it exists. As the Phase Due to Complete report, pulls on any open works which are due to end, it is likely that no works remain open that meet the criteria as all the active works have been closed down, therefore the value not available in the drop down list. Whereas the Phase Due to Start report is more is likely to have some new works which have been created and will start soon, so in this case it will show the district in the drop down. You may find that no data is returned for today but as there are still works which fit the criteria the value is available in the drop down list.