1) Latitude and Longitude are not generating automatically.
Please make sure the address you entered is complete including a zip code.
You can "google" the address, it'll show a map with a correct address. Please copy it and paste it to the address field
2) The marker on the map is not correct.
It may happen that even though the address you entered is correct, the marker on the map is a little bit off.
You can manually adjust Latitude and Longitude.
Just click on then drag and drop the marker on the map in a correct location.