is it normal session workflow?

[eluser]Unknown[/eluser]
please review attached screen. Why we can see several session records with the same ip and UA?

http://imgur.com/5Wcao

$config['sess_cookie_name'] = 'cisession';
$config['sess_expiration'] = 172800; //48 hours
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie'] = TRUE;
$config['sess_use_database'] = TRUE;
$config['sess_table_name'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_match_useragent'] = FALSE;
$config['sess_time_to_update'] = 300;

CI ver
define('CI_VERSION', '2.1.0');


also was impemented just in case http://ellislab.com/forums/viewthread/138823/