php update query with order - php

Question

please i am having issues concerning the order of records after updating.
I have two pages home.php and settings.php.
The home.php contains result from a mysli select query.
$getid = $getdata['user_id'];
$query = mysqli_query($con,"SELECT * FROM posts WHERE `user_id` = ' $get_id' ORDER BY date_added DESC LIMIT 15 ");
The records being selected are id username notes date_added, these records are successfully displayed in desc order.
On my settings.php i'm allowing the user to update their username,while updating their username,i also run a update query that change the username on the notes table. New username are successfully updated both on the user table and notes table. But the unfortunate things is,when i get back to the home.php , the notes are not displayed in desc order again. it is displaying the notes from the top of the table.
The update query function(called from the settings.php):
function update_user($update_data){
$con = db();
global $session_user_id;
$update= array();
array_walk($update_data, 'array_sanitize');
foreach ($update_data as $field => $data) {
$update[] = '`'. $field . '` =\''.$data .'\'';
}
mysqli_query($con,"UPDATE `users` SET " . implode(', ', $update) . , " WHERE `user_id` = '$session_user_id'");
mysqli_query($con,"UPDATE notes SET username = (SELECT `username`FROM users WHERE user_id = $session_user_id) WHERE user_id = $session_user_id ");}
I have tried ordering by date_added, it's not working still.
Kindly help me out, thanks.