jtable atualiza com dados repetidos

public class setorDAO {

    Session session = HibernateUtil.getSessionFactory().openSession();
    

    public boolean salvar(Setor setor) {
        try {
            session.beginTransaction();
            session.save(setor);
            session.getTransaction().commit();

            return true;
        } catch (Exception e) {
            session.getTransaction().rollback();
            JOptionPane.showMessageDialog(null, "erro" + e.getMessage());
            return false;
        }

    }

    public boolean alterar(Setor setor) {

        try {

            session.beginTransaction();
            session.merge(setor);
            session.getTransaction().commit();
            return true;
        } catch (Exception e) {
            session.getTransaction().rollback();
            return false;

        }
    }

    public boolean excluir(Setor setor) {

        try {

            session.beginTransaction();
            session.delete(setor);
            session.getTransaction().commit();
            return true;
        } catch (Exception e) {
            session.getTransaction().rollback();
            return false;
        } finally {
            session.close();
        }
    }

    public Setor consultar(int id) {
        Setor retorno = new Setor();
        try {

            session.beginTransaction();
            retorno = (Setor) session.get(Setor.class, id);
            session.getTransaction().commit();
        } catch (Exception e) {
            session.getTransaction().rollback();
        } finally {
            session.close();
        }
        return retorno;
    }

    public Setor carregar(String hql) {
        return (Setor) this.session.createQuery(hql).setCacheable(true).uniqueResult();
    }

    @SuppressWarnings("unchecked")
    public List<Setor> listar() {
        List<Setor> lista = new ArrayList<>();
        try {
            session = (Session) HibernateUtil.getSessionFactory();
            session.beginTransaction();
            lista = (List<Setor>) session.createCriteria(Setor.class).list();
            session.getTransaction().commit();
        } catch (Exception e) {
            session.getTransaction().rollback();
        } finally {
            session.close();
        }
        return lista;
    }

    @SuppressWarnings("unchecked")
    public List<Setor> listar(Setor setor) {
        Criteria c = session.createCriteria(Setor.class);
        if (setor.getNome().length() > 0) {
            c.add(Restrictions.like("nome", setor.getNome() + "%"));
        }
        c.addOrder(Order.asc("nome"));
        return (List<Setor>) c.list();
    }

@Entity
@Table(name = "setor")
public class Setor implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "nome", length = 20, unique = true)
    private String nome;

    @Column(name = "status", length = 10)
    private String status;

    @Temporal(TemporalType.TIMESTAMP)
    private Date dataCadastro;

    @Temporal(TemporalType.TIMESTAMP)
    private Date dataAlteracao;

    private Long usuarioAlteracao;

    public String getNome() {
        return nome;
    }

    public Setor() {
    }

    public Setor(Long id, String nome, String status, Date dataCadastro, Date dataAlteracao, Long usuarioAlteracao) {
        this.id = id;
        this.nome = nome;
        this.status = status;
        this.dataCadastro = dataCadastro;
        this.dataAlteracao = dataAlteracao;
        this.usuarioAlteracao = usuarioAlteracao;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Date getDataCadastro() {
        return dataCadastro;
    }

    public void setDataCadastro(Date dataCadastro) {
        this.dataCadastro = dataCadastro;
    }

    public Date getDataAlteracao() {
        return dataAlteracao;
    }

    public void setDataAlteracao(Date dataAlteracao) {
        this.dataAlteracao = dataAlteracao;
    }

    public Long getUsuarioAlteracao() {
        return usuarioAlteracao;
    }

    public void setUsuarioAlteracao(Long usuarioAlteracao) {
        this.usuarioAlteracao = usuarioAlteracao;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    

    @Override
    public String toString() {
        return "Setor{" + "id=" + id + ", nome=" + nome + ", status=" + status + ", dataCadastro=" + dataCadastro + ", dataAlteracao=" + dataAlteracao + ", usuarioAlteracao=" + usuarioAlteracao + '}';
    }



}