Change Password Script

Hello there,

I don't know where the problem lies, for some reasons, the code bellow doesn't work.

Script:

<?php
require_once '../includes/connection.php';

function clean($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}

if (! empty($_POST) ):

    $current_password = clean($_POST["current_password"]);
    $new_password = clean($_POST["new_password"]);
    $repeat_password = clean($_POST["repeat_password"]);
    $username = clean($_POST['username']);
    

    $userPass = $conn->prepare("SELECT Password FROM Users WHERE Username = ? LIMIT 1");
    $userPass->bind_param( "s", $username );
    $userPass->execute();
    $result = $userPass->get_result();
    $userPassword = $result->fetch_object();

    if ( $userPassword->Password == $current_password ):

        $query = "UPDATE Users SET Password = ? WHERE Username = ? ";
        $result = $conn->prepare($query);
        $result->bind_param( "ss", $new_password, $username );

        if ( $result->execute() ):

            $response = "<div class='alert alert-success'><button type='button' class='close' data-dismiss='alert' aria-label='Close'><span aria-hidden='true'>&times;</span></button>
                Password changed successfully.</div>";
            die( $response );

        else:

            $response = "<div class='alert alert-danger'><button type='button' class='close' data-dismiss='alert' aria-label='Close'><span aria-hidden='true'>&times;</span></button> ".$conn->error." </div>";

            die( $response );
        
        endif;
        
    endif;

endif;
?>

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Ajax:

$(document).ready(function(){
        $('#changepass').click(function() {

                $.ajax({
                url     : 'change_pass.php',
                method  : 'post',
                data    : $('#changePassword-form').serialize(),
            }).done(function(response) {
                $('#response').html(response);

            });         
        });

    });

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Modal form:

<!--Change Password Modal -->
<div id="changepass" class="modal fade" role="dialog">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h4 class="modal-title">User: <?=$session_username ?></h4>
                <button type="button" class="close" data-dismiss="modal">&times;</button>
            </div>
            <div class="modal-body">
                <div id="response"></div>
                <div class="auth-content">
                    <p class="text-center">CHANGE PASSWORD</p>
                    <form id="changePassword-form" action="change_pass.php" method="POST" novalidate="">
                        <input type="hidden" name="username" id="username" value="<?=$session_username ?>"> 
                        <div class="form-group">
                            <label for="current_password">Old Password <span style=color:red;> *</span></label>
                            <input type="password" class="form-control underlined" name="current_password" id="current_password" placeholder="Your Old Password" required> 
                        </div>
                        <div class="form-group">
                            <label for="new_password">New Password <span style=color:red;> *</span></label>
                            <input type="password" class="form-control underlined" name="new_password" id="new_password" placeholder="Your New Password" required> 
                        </div>
                        <div class="form-group">
                            <label for="repeat_password">New Password <span style=color:red;> *</span></label>
                            <input type="password" class="form-control underlined" name="repeat_password" id="repeat_password" placeholder="Your New Password" required> 
                        </div>
                        <div class="form-group">
                            <button type="submit" name="changepass" class="btn btn-block btn-primary">Reset Password</button>
                        </div>
                        <div class="form-group">
                            <p class="text-muted text-center">Created by orpee2k2
                            </p>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div><!-- /.modal -->

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Thanks for helping.