You must be using code different from the one I posted.  When I use your input %xhash and %c_hash in the exact above code, I get

$VAR1 = {
          '1' => [
                   {
                     '4' => [
                              {
                                '11' => [
                                          'E',
                                          'G'
                                        ],
                                'content' => 'D
',
                                '10' => [
                                          'C'
                                        ]
                              }
                            ],
                     'content' => 'A
',
                     '2' => [
                              {
                                '3' => [
                                         'C'
                                       ],
                                'content' => 'B
',
                                '5' => [
                                         'E',
                                         'G'
                                       ]
                              }
                            ]
                   }
                 ]
        };
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