Session will not show new values - php

Question

I have been trying to get my session update, I have created a basic update with mysql as well, it updates in the sql database but it will not show the change within the page.
I'm not sure what else to check, because I checked within the chrome settings and it does show a php session id value but if I go into session storage it shows nothing.
transaction.php
<?php
$_title = 'Update profile';
require_once(__DIR__.'../../components/header.php');
session_start();
if(! isset($_SESSION['user_name'])){
header('Location: ../sign_in/sign_in.php');
die();
}
if (!isset($_SESSION["lang"])) { $_SESSION["lang"] = "en"; }
if (isset($_POST["lang"])) { $_SESSION["lang"] = $_POST["lang"]; }
require_once(__DIR__.'../../globals.php');
require_once(__DIR__.'../../db.php');
try{
$db = _db();
}catch(Exception $ex){
_res(500, ['info'=>'System under maintainance','error'=>__LINE__]);
}
$userProduct = $_SESSION['user']['user_id'];
$q = $db->prepare('SELECT * FROM users WHERE user_id = :userID');
$q->bindValue(":userID", $userProduct);
$q->execute();
require "../lan/lang." . $_SESSION["lang"] . ".php";
?>
<form class="style_form" id="update_profile" onsubmit="return false">
<div>
<label for="name"><?=$_TXT[63]?></label>
<input type="text" name="name" value="<?php echo $_SESSION['user']['user_name']?>">
</div>
<div>
<label for="last_name"><?=$_TXT[64]?></label>
<input type="text" name="last_name" value="<?php echo $_SESSION['user']['lastName']?>">
</div>
<div>
<label for="email"><?=$_TXT[65]?></label>
<input name="email" value="<?php echo $_SESSION['user']['email']?>" type="text">
<input type="hidden" name="userId" value="<?php echo $_SESSION['user']['user_id'] ?>">
<button onclick="update()" id="updateButton"><?=$_TXT[60]?></button>
</form>
</section>
<?php
require_once(__DIR__.'../../components/footer.php');
?>
api-transaction.php
<?php
require_once(__DIR__.'../../globals.php');
// Validate name
if( ! isset( $_POST['name'] ) ){ _res(400,['name is required']); }
if( strlen( $_POST['name'] ) < _FRIST_NAME_MIN_LEN ){ _res(400,['name min '._FRIST_NAME_MIN_LEN.' characters']); }
if( strlen( $_POST['name'] ) > _FRIST_NAME_MAX_LEN ){ _res(400,['name max '._FRIST_NAME_MAX_LEN.' characters']); }
// Validate last_name
if( ! isset( $_POST['last_name'] ) ){ _res(400,['last_name is required']); }
if( strlen( $_POST['last_name'] ) < _LAST_NAME_MIN_LEN ){ _res(400,['last_name min '._LAST_NAME_MIN_LEN.' characters']); }
if( strlen( $_POST['last_name'] ) > _LAST_NAME_MAX_LEN ){ _res(400,['last_name max '._LAST_NAME_MAX_LEN.' characters']); }
// Validate email
if( ! isset( $_POST['email'] ) ){ _res(400,['email is required']); }
if( ! filter_var( $_POST['email'], FILTER_VALIDATE_EMAIL ) ){ _res(400,['email is invalid']); }
$db = require_once(__DIR__.'../../db.php');
try{
session_start();
// $userid = $_SESSION['userId'];
// $userid = $_SESSION['user']['user_id'];
$userid = $_POST['userId'];
$db->beginTransaction();
//Change name
$q = $db->prepare('UPDATE users SET user_name = :update_Name WHERE user_id = :userid');
$q->bindValue(':userid',$userid);
$q->bindValue(':update_Name', $_POST['name']);
$q->execute();
//Change last name
$q = $db->prepare('UPDATE users SET lastName = :update_lastName WHERE user_id = :userid');
$q->bindValue(':userid',$userid);
$q->bindValue(':update_lastName', $_POST['last_name']);
$q->execute();
//change email
$q = $db->prepare('UPDATE users SET email = :update_email WHERE user_id = :userid');
$q->bindValue(':userid',$userid);
$q->bindValue(':update_email', $_POST['email']);
$q->execute();
// change phone number
$q = $db->prepare('UPDATE users SET phone_number = :update_phone WHERE user_id = :userid');
$q->bindValue(':userid',$userid);
$q->bindValue(':update_phone', $_POST['phone_number']);
$q->execute();
$db->commit();
header('Content-Type: application/json');
$response = ["info" => "info has been updated"];
echo json_encode($response);
}catch(Exception $ex){
http_response_code(500);
echo $ex;
echo 'System under maintainance';
exit();
}