The geocode feature is based off of two simple requirements. First the address must be a real address (1234 Main St. will not work)and second the address must be complete. If your geocode is not working properly make sure the address is correct. After you have checked this and the geocode is still incorrect, add as much information about the property as you can. Make sure the address, city, county, state and zip code are all entered.
Once the above has been tested and the geocode is still off, please send an email to firstname.lastname@example.org detailing the issue. Please include screenshots in the email if possible.