3d problem with a simple title game

[diego]

in practice I create the tile passing them row and column:

 int a=0;
  for (int c = 0; c <colonne; c++) {
    for (int r = 0; r <righe; r++) {
      arraymatonelle[a] =new mattonella();
      arraymatonelle[a].crea(r, c, (a==(mattonellaVuota)), a);
      a++;
    }
  }

then the tile calculates the coordinates by itself:

  void crea(int r, int c, boolean sevuoto,int a) {
    numero=a;
    Rigaecolonna.set(r, c);
    img = createImage(width/ righe, height/ colonne, RGB);
    cordinateFoto.set( Rigaecolonna.x*img.width, Rigaecolonna.y*img.height);
    cordinate.set( Rigaecolonna.x*img.width, Rigaecolonna.y*img.height);
    cordinatecopia.set( Rigaecolonna.x*img.width, Rigaecolonna.y*img.height);
    vuoto=sevuoto;

  }

then, always the tile is drawn in the coordinates:

    lato1.vertex(cordinate.x,cordinate.y,  cordinate.z, 0, 0);

the photos show the result but I don’t understand why, sorry but a mcve it is difficult for me to do it!
thank you