[1]=>
  array(1) {
    [1]=>
    array(2) {
      [0]=>
      string(1) "1"
      [1]=>
      string(2) "20"
    }
  }


it should have another string after 20 of 16


so it should be:

[1]=>
  array(1) {
    [1]=>
    array(2) {
      [0]=>
      string(1) "1"
      [1]=>
      string(2) "20"
      [2]=>
      string(3) "16" (i think)
    }
  }