Active Record "get()" with "limit()" and pagination/uri segment value displaying one too few results

[eluser]fiddle-sticks[/eluser]
Hi please can somebody tell me why I am only getting a result of 11 items instead of 12 on the first page (no 3rd uri segment) with the following code.

Code:

$limit = 12;
$offset = $this->uri->segment(3, 0);
$this->db->order_by('created', 'desc');
$this->db->where('is_private !=', '1');
$row = $this->db->get('pictures', $limit, $offset);

Thanks in advance.
Ps Im not sure if posted this in the right place because I couldnt find exactly where this shoul be posted.
Regards