Select IF

Tenho esta query

$qry = $db->query("
SELECT
messages.id, messages.type,
IF(messages.type = 'agent', 'Agent', 'User') as name
FROM
messages
LEFT JOIN users ON users.id=messages.uid
LEFT JOIN agents ON agents.id=messages.aid
WHERE messages.uid='" . $UserID . "'");

Mas o name esta sempre a retornar User

[optional]array

0 =>

object(stdClass)[3]

 public 'id' => string '1' (length=1)

 public 'type' => string 'user' (length=4)

 public 'name' => string 'User' (length=4)

 1 =>

 object(stdClass)[4]

 public 'id' => string '2' (length=1)

 public 'type' => string 'agent' (length=5)

 public 'name' => string 'User' (length=4)

 2 =>

 object(stdClass)[5]

 public 'id' => string '3' (length=1)

 public 'type' => string 'agent' (length=5)

 public 'name' => string 'User' (length=4)[/optional]

Estou a fazer errado ?