JsonResponse returns the json response plus the request data in string format problem

I'm making post requests using ajax in my symfony 4.4 project, and i return the response using fosrestbundle, sometimes it returns a correct json response but sometimes, the response includes also the data sent with request as a string, which is strange, and i don't know why.

This is my ajax request (** i'm using jsrouting-bundle to embed my routes into javascript):

 var url = Routing.generate('orders_change_status', {id: order.id}, true);    $.ajax({        type: "PUT",        url: url,        data: data,        success: function (data) {        }, error: function (xhr, status, error) {        }    });

And this is my response :

 /** * @Route("/orders/change_status/{id}", name="orders_change_status", methods={"PUT"}) */public function changeStatus(Request $request, $id){    $status = $request->request->get("status");    if (isset($id) && isset($status)) {        $data = $request->request->all();        $apiResponse = $this->apiHelper->changeOrderStatus($id, $data);        $jsonData = json_decode($apiResponse->getBody()->getContents());        $checked = $this->hasErrors($apiResponse, $jsonData);        if ($checked) {            $flash = $request->request->get("flash");            if (isset($flash) && $flash == 1)                $this->addFlash('order_success', $this->translator->trans("The order has been edited successfully"));            return new JsonResponse(array("code" => Response::HTTP_OK, "test" => "test"), Response::HTTP_OK);        }    }    return View::create(array("code" => Response::HTTP_BAD_REQUEST, "message" => "Something went wrong!"), Response::HTTP_BAD_REQUEST);}public function changeOrderStatus($id, $data){    $data['author-id'] = $this->security->getUser()->getId();    return $this->client->put($this->getApiUrl() . '/orders/' . $id . '/change_status', ['json' => $data    ]);}

Somtimes the response is correct in json format :

{"code":200,"message":"test"}

But sometimes it includes the data sent as a string, i don't know why :

status=3&note=No+Answer&flash=1&postponed_to=2022-05-17+12%3A36{"code":200,"message":"test"}

This happens only in production environment!!