Golang query scan not scanning query correctly into struct

Question

I am having trouble with scanning from a pgx query in Golang. The id field is always that of the last record. If I un-comment the var person Person declaration at the top of the function, every id is 3. There are 3 records with id's from 1 to 3 in my db. When I comment that declaration and declare the variable in the rows.Next() loop I get the correct id's. I can't figure out why the personId isn't being correctly overwritten

output from marshalled JSON with the var declared at the top of the function.

[{"person_id":3,"first_name":"Mark","last_name":"Brown"},{"person_id":3,"first_name":"Sam","last_name":"Smith"},{"person_id":3,"first_name":"Bob","last_name":"Jones"}]

output after declaring person every iteration of the scan loop

[{"person_id":1,"first_name":"Mark","last_name":"Brown"},{"person_id":2,"first_name":"Sam","last_name":"Smith"},{"person_id":3,"first_name":"Bob","last_name":"Jones"}]

I have this struct

// Person model
type Person struct {
    PersonId       *int64   `json:"person_id"`
    FirstName      *string  `json:"first_name"`
    LastName       *string  `json:"last_name"`
}

Here is my query function

func getPersons(rs *appResource, companyId int64) ([]Person, error) {

    //  var person Person

    var persons []Person

    queryString := `SELECT 
      user_id, 
      first_name, 
      last_name,
      FROM users 
      WHERE company_id = $1`

    rows, err := rs.db.Query(context.Background(), queryString, companyId)

    if err != nil {
        return persons, err
    }

    for rows.Next() {

        var person Person

        err = rows.Scan(
            &person.PersonId,
            &person.FirstName,
            &person.LastName)

        if err != nil {
            return persons, err
        }

        log.Println(*person.PersonId) // 1, 2, 3 for both var patterns

        persons = append(persons, person)
    }

    if rows.Err() != nil {
        return persons, rows.Err()
    }

    return persons, err
}