Wikipedia has Royston, Georgia within 3 counties: Franklin, Hart, and Madison. The WikiTree category has Royston, Georgia linked to all 3 of those counties. Presumably this information is correct (not an unusual occurrence, as cities tend to grow).
If you are using both the county and city categories on a profile, you should delete the county category. We generally want to categorize in the lowest subcategory that is relevant to the profiled individual.
Also, as you source profiles in Royston, you may find that the county will vary!