angular 2 post to a database works on firefox but not on chrome

so this drive me insane :)
the same code work on firefox but not on chrome.

i test angular 2 "ajax calls", this time sending data to insert into the database, and send back the inserted item.

so this is in the service:

  addUser(){
    var theparams = JSON.stringify({
      name: "fabian",
      address: "dizingoff 99, NY",
      lat: 33.060143,
      lng: 39.770557
    });
    var params = 'user=' + theparams;
    var headers = new Headers();
    headers.append('Content-type', 'application/x-www-form-urlencoded');

    return this._http.post('http://localhost:80/ang2router/public/addContact.php', params,{
      headers: headers
    })
    .map(res => res.json());

  }

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this is hard coded for testing obviously.
then i call it on a button click:

      this._httpsService.addUser()
      .subscribe(
        data => this.postData = data,
        error => alert(error),
        () => console.log("Finished")
      );

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then the php file that insert it into the database and get it back:

$value = json_decode($_POST['user']);
header("Access-Control-Allow-Origin: *");
header('Access-Control-Allow-Headers: X-Requested-With');
header('Content-Type: application/json');
//var_dump($value->name);

        $db_name  = 'mydb';
        $hostname = 'localhost';
        $username = 'myusername';
        $password = 'mypass';

        // connect to the database
       $dbh = new PDO("mysql:host=$hostname;dbname=$db_name", $username, $password);



    // a query get all the records from the users table
    $sql = 'INSERT INTO markers ( name, address,lat, lng ) 
        VALUES ( "' . $value->name .'" , "'.$value->address.'", '.$value->lat.' , '.$value->lng.' );';

    
    $stmt = $dbh->prepare( $sql );

   
    $check = $stmt->execute();

    $last_id = $dbh->lastInsertId();

    $sql2 = "SELECT * FROM markers WHERE id=$last_id ";

   
    $stmt = $dbh->prepare( $sql2 );

    
    $stmt->execute();

    // fetch the results into an array
    $result = $stmt->fetchAll( PDO::FETCH_ASSOC );
                                                        
    echo json_encode($result);

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in firefox all goes well, the data is in the database and i get the last inserted id back.
but on chrome not. i attach what i get on chrome.

best regards
Screenshot--65-.png
Screenshot--66-.png