CodeIgniter table class loops through db records 3 times - why?

This is my controller code (using Colin Williams' Template class):

$this->load->library('table');
$table['records'] = $this->db->get_where('data', array('category_1' => 'weight'));
$this->template->write_view('content', 'vw/weight_vw', $table, TRUE);

And my view code:

<div class="grid_16">
    <?php echo $this->table->generate($records); ?>
</div>

Look at what I get

2   1   29  2011-01-01      10  weight      
4   1   29  2010-11-03      11  weight      
5   1   29  2011-05-02      10  weight      
6   1   42  2011-07-11      23  weight // the database only has records up to here      
2   1   29  2011-01-01      10  weight  // from here on it's repeated twice 
4   1   29  2010-11-03      11  weight      
5   1   29  2011-05-02      10  weight      
6   1   42  2011-07-11      23  weight      
2   1   29  2011-01-01      10  weight      
4   1   29  2010-11-03      11  weight      
5   1   29  2011-05-02      10  weight      
6   1   42  2011-07-11      23  weight

Any ideas why this is happening? None of my code is inside a loop or anything like that.

Use

 $this->output->enable_profiler()

to see the db queries.

Take the query and run it against your db directly.

It's most likey you have a bad join in your database model.