MySQL or PHP is appending a ? whenever the ? is used

// Create file and exit;
$filename = $file."_".date("Y-m-d_H-i",time());
header("Content-type: application/vnd.ms-excel");
header("Content-disposition: csv" . date("Y-m-d") . ".csv");
header( "Content-disposition: filename=".$filename.".csv");
echo $csv_output;

// Create file and exit;
$filename = $file."_".date("Y-m-d_H-i",time());
header("Content-type: text/csv; charset=ISO-8859-1");
header("Content-disposition: csv" . date("Y-m-d") . ".csv");
header("Content-disposition: filename=".$filename.".csv");

echo iconv('UTF-8', 'ISO-8859-1', $csv_output);

mysql> SHOW COLUMNS FROM fraud_report;
+--------------+--------------+------+-----+---------+----------------+
| Field        | Type         | Null | Key | Default | Extra          |
+--------------+--------------+------+-----+---------+----------------+
| id           | mediumint(9) |      | PRI | NULL    | auto_increment |
| crm_number   | varchar(32)  | YES  |     | NULL    |                |
| datacash_ref | varchar(32)  | YES  |     | NULL    |                |
| amount       | varchar(32)  | YES  |     | NULL    |                |
| sales_date   | varchar(32)  | YES  |     | NULL    |                |
| domain       | varchar(32)  | YES  |     | NULL    |                |
| date_added   | datetime     | YES  |     | NULL    |                |
| agent_added  | varchar(32)  | YES  |     | NULL    |                |
+--------------+--------------+------+-----+---------+----------------+
8 rows in set (0.03 sec)

function    processFraudForm($crm_number, $datacash_ref, $amount, $sales_date, $domain, $agent_added) {

    // Insert Data to DB
    $sql    = "INSERT INTO fraud_report (id, crm_number, datacash_ref, amount, sales_date, domain, date_added, agent_added) VALUES (NULL, '$crm_number', '$datacash_ref', '$amount', '$sales_date', '$domain', NOW(), '$agent_added')";
    $result = mysql_query($sql) or die (mysql_error());

    if ($result) {
        $outcome = "<div id="success">Emails sent and database updated.</div>";
    } else {
        $outcome = "<div id="error">Something went wrong!</div>";
    }

    return $outcome;
}

+----+------------+--------------+---------+------------+--------------------+---------------------+------------------+
| id | crm_number | datacash_ref | amount  | sales_date | domain             | date_added          | agent_added      |
+----+------------+--------------+---------+------------+--------------------+---------------------+------------------+
| 13 | 100xxxxxxx | 10000000     | £10.93 | 18/12/08   |  blargh.com        | 2008-12-22 10:53:53 | agent.name |

print iconv('UTF-8', 'ASCII//TRANSLIT', "Mystring â"); //"Mystring "