ListView does not load all items

I'm using ListView in my project, it was doubling the values, until I put the ELSE of that condition:

if(convertView == null)...
else...

After this it stopped duplicating, but also stopped showing all 12 items, now showing only the first 2. Can anyone identify the problem?

Additional information: - Each item in the list contains 2 information, stored in ArrayList (Product Name and Price)

Following codes.

Calling the adapter in LoadList.java:

ArrayList<String[]> valores = new ArrayList<String[]>();
...
//apenas para entendimento, código está ok
String tmp = nome+";"+valor;
String[] val = tmp.split(";");

valores.add(val); //valores.get(i) = Array de String [0]nome / [1]valor
Log.e("tamanho valores", String.valueOf(valores.size())); //imprime 12 (correto)

adapter = new Adaptador(CarregarLista.this, R.layout.item_lista, valores);
lista = (ListView) findViewById(R.id.listaProd);
lista.setAdapter(adapter);
...

VARIABLES: ArrayList values ends the above code snippet with the values:

ArrayList valores(12) {
    (0):  Array[0] Hamburguer 1     Array[1]R$ 14,90
    (1):  Array[0] Hamburguer 2     Array[1]R$ 16,90
    (2):  Array[0] Hamburguer 3     Array[1]R$ 14,90
    (3):  Array[0] Hamburguer 4     Array[1]R$ 16,90
    (4):  Array[0] Hamburguer 5     Array[1]R$ 14,90
    (5):  Array[0] Hamburguer 6     Array[1]R$ 16,90
    (6):  Array[0] Hamburguer 7     Array[1]R$ 14,90
    (7):  Array[0] Hamburguer 8     Array[1]R$ 16,90
    (8):  Array[0] Hamburguer 9     Array[1]R$ 14,90
    (9):  Array[0] Hamburguer 10    Array[1]R$ 16,90
    (10): Array[0] Hamburguer 11    Array[1]R$ 14,90
    (11): Array[0] Hamburguer 12    Array[1]R$ 16,90
}

The only ones that are shown in the ListView are

Values.get (0) [0] Hamburger 1

values.get (0) [1] R $ 14,90

Values.get (1) [0] Hamburger 2

values.get (1) [1] R $ 16,90

Adapter.java class that fills the ListView:

public class Adaptador extends ArrayAdapter<String> {
    private ArrayList<String[]> valores;

    public Adaptador(Context context, int textViewResourceId, ArrayList<String[]> objects) {
        super(context, textViewResourceId, objects.get(0));
        valores = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View linha;
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            linha = inflater.inflate(R.layout.item_lista_hamburguer, parent, false);
        }else {
            linha = convertView;
            Log.e("debug", "Essa linha aparece 2x no Logcat");
        }
        Log.e("debug", "Essa linha aparece 4x no Logcat");

        TextView valor = (TextView) linha.findViewById(R.id.item_valor);
        valor.setText(valores.get(position)[1]);
        TextView nome = (TextView) linha.findViewById(R.id.item_nome);
        nome.setText(valores.get(position)[0]);

        return linha;
    }
}