A quick way to check if the organisation unit import with GPS data was successful is to:
Open the “Maintenance” app
Go to “Organisation units”
Search for the units for which you added latitude/longitude
See if, once you click on a unit, you are able to view the coordinates
If you are not able to view the coordinates, they were not successful in importing. If they are indeed there, this may be an issue with analytics or the way you are pulling the data in GIS, but the first step would be to check if they imported successfully.