PHPExcel在一起的单元格包含相同的数据问题

当我使用PHPExcel类读取ods文件（xls和xlsx可以）时，两个单元格在一起并包含相同的数据，第二个单元格变为空，这是错误吗？这是我的代码：

<?php
set_include_path(get_include_path() . PATH_SEPARATOR . '../../Librerias/phpexcel/Classes/');
include 'PHPExcel/IOFactory.php';
$input_fileName = dirname(__FILE__) . '/bug.ods';
$input_file_type = PHPExcel_IOFactory::identify($input_fileName);   
$reader = PHPExcel_IOFactory::createReader($input_file_type);
$reader->setReadDataOnly(true); 
$objPHPExcel = $reader->load($input_fileName);  
$objPHPExcel->setActiveSheetIndex(0);
$rowIterator = $objPHPExcel->getActiveSheet()->getRowIterator();
$array_data = array();
foreach($rowIterator as $row){
    $cellIterator = $row->getCellIterator();
    $cellIterator->setIterateOnlyExistingCells(false);
    $rowIndex = $row->getRowIndex ();    
    foreach ($cellIterator as $cell) {
            $array_data[$rowIndex][$cell->getColumn()] = $cell->getCalculatedValue();
    }
}
echo '<pre>' ; print_r($array_data); echo '</pre>' ;

？>

以下是bug.ods 的内容

  | A   |   B   |   C   |   D   |   E   |   F
-----------------------------------------------
1 | 1   |   1   |   2   |   2   |   3   |   3
2 | 2   |   2   |   1   |   1   |   3   |   3
3 | 3   |   3   |   1   |   1   |   2   |   2
4 | a   |   a   |   b   |   b   |   c   |   c
5 | b   |   b   |   a   |   a   |   c   |   c
6 | c   |   c   |   a   |   a   |   b   |   b

这是print_r输出。

Array
(
    [1] => Array
        (
            [A] => 1
            [B] => 
            [C] => 2
            [D] => 
            [E] => 3
        )
    [2] => Array
        (
            [A] => 2
            [B] => 
            [C] => 1
            [D] => 
            [E] => 3
        )
    [3] => Array
        (
            [A] => 3
            [B] => 
            [C] => 1
            [D] => 
            [E] => 2
        )
    [4] => Array
        (
            [A] => a
            [B] => 
            [C] => b
            [D] => 
            [E] => c
        )
    [5] => Array
        (
            [A] => b
            [B] => 
            [C] => a
            [D] => 
            [E] => c
        )
    [6] => Array
        (
            [A] => c
            [B] => 
            [C] => a
            [D] => 
            [E] => b
        )
)

我做错什么了吗？是虫子吗？

有什么想法吗？