[PHP] mysql improved extensions affected_rows

[Tom]

I've just started playing with the php5 improved mysqli extensions.
I have the following code:-
<?php
$mysqlim = new mysqli("localhost", "myUser", "myPassword","myDB");
$updateQuery = "UPDATE client SET status = 'INACTIVE' WHERE clientName = 
'Tom'";

if ($mysqli->query($updateQuery))
{
   $updateCount = $mysqli->affected_rows;
   echo "<br>updateCount = $updateCount";
}
else
{
   excpetionHandler("updateFailed: ".$updateQuery);
}
?>
This returns "updateCount = 1"
However, when I check the underlying table, there are actually 4 rows 
updated (and yes, before anyone asks, I have repeated this several 
times, correctly resetting the data before each run)

Is this a known bug, or am I doing something stupid?
(php 5.0.2, apache 2.0.49)
Thanks
Tom
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