saveall on habtm creates duplicate new rows

[ajt]

Hi, I have a simple HABTM  with a lessons/Students table. i simply create a 
new lesson with an existing student via a while loop , so I should get 2 
new rows. I am testing this function. What I get is 4 new rows in the 
lesson table instead of 2. I have no idea why the extra 2 rows are created 
as they are a duplicates of the 2 new rows which are outputted in debug. 
Everything is correctly saved like the entries in join lesson/student table 
and all the FK exist.

Just to add confusion, sometimes the same code produces the desired 2 rows 
. This is unstable so I am doing something wrong. I followed the array 
setup for habtm as in the manual for saves.

http://book.cakephp.org/2.0/en/models/saving-your-data.html

     private function book_lessons($lesson=null) {
        
           // debug( $lesson);
         
         $i=0;
         while ($i<2)
         {
          $date=date('Y-m-d');
          $data[$i]=array();
          
          
          $data[$i]['Lesson']['lesson_date']= $date;
          $data[$i]['Lesson']['start_time']= 
$lesson['Lesson']['start_time'];
          $data[$i]['Lesson']['end_time']=$lesson['Lesson']['end_time'];
        
          $data[$i]['Lesson']['schedule_rec']= 1;
          $data[$i]['Lesson']['subject_id']= 
$lesson['Lesson']['subject_id'];
          $data[$i]['Lesson']['tutoring_type_id']= 1;
          $data[$i]['Lesson']['tutor_id']= $lesson['Lesson']['tutor_id'];
          $data[$i]['Lesson']['subject_id']= 
$lesson['Lesson']['subject_id'];
          $data[$i]['Lesson']['term_id']= $lesson['Lesson']['term_id'];
            
          $data[$i]['Student']['id']=$lesson['Student']['id'];
         
         $i=$i+1;
         
         }
         
        
          $this->Lesson->saveAll($data);
    
    public $hasAndBelongsToMany = array(
        
            'Student' => array(
                'className' => 'Student',
                'joinTable' => 'lessons_students',
                'foreignKey' => 'lesson_id',
                'associationForeignKey' => 'student_id',
                'unique' => 'keepExisting',
                
            )
        );
    
    
    array(
        (int) 0 => array(
            'Lesson' => array(
                'lesson_date' => '2015-06-11',
                'start_time' => '16:00:00',
                'end_time' => '17:00:00',
                'schedule_rec' => (int) 1,
                'subject_id' => '16',
                'tutoring_type_id' => (int) 1,
                'tutor_id' => '12',
                'term_id' => '10'
            ),
            'Student' => array(
                'id' => '206'
            )
        ),
        (int) 1 => array(
            'Lesson' => array(
                'lesson_date' => '2015-06-11',
                'start_time' => '16:00:00',
                'end_time' => '17:00:00',
                'schedule_rec' => (int) 1,
                'subject_id' => '16',
                'tutoring_type_id' => (int) 1,
                'tutor_id' => '12',
                'term_id' => '10'
            ),
            'Student' => array(
                'id' => '206'
            )
        )
    )

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