Laravel Session cleared on AJAX CALL

I have created some cart data in the session having key cart data when I hit any post ajax route the data of the session reset automatically. where is wrong in this here the controller where I check for user phone no for checking login status but when I hit this with ajax the session data clear automatically

my controller code is `public function check(Request $request) { //dd(Session::all());

    $validator = Validator::make($request->all(), [
                'phone' => 'required|numeric|',
    ]);
    if ($validator->fails()) {
        // return redirect()->back()->with('errors',$validator->errors())->withInput($request->only('phone', 'remember'));
        return response()->json(['success' => false, 'error' => $validator->errors()], 403);
    } else {

        $string = strlen('+91' . $request->phone);

        if ($string < 13) {

            return response()->json(['success' => 'invalid', 'message' => 'Please Enter a Valid Phone Number'], 401);
        }

        //dd($request->phone);

        $data = DB::table('users')->where('phone', $request->phone)->get();

        if ($data->count() <= 0) {


            return response()->json(array('success' => true, 'message' => 1, 'phone' => $request->phone));
        } else {
            return response()->json(array('success' => false, 'message' => 'The phone has already been taken.Please Login', 'phone' => $request->phone), 403);
        }
    }
}`

and my ajax call is : `axios.post(process.env.MIX_BASEURL+'/checkphone',

                    vm.checkphone,

                    )
                    .then(response => {

                        console.log(response)                                                 
                    if(response.status==200){
                        //alert('no can register');
                        if(response.data.message==1){
                            let phone_no=response.data.phone;
                            //sendotp(phone_no);
                            $("#phone1").addClass("is-valid");
                            showRegisterFormnext(phone_no);
                        }
                    }

                    })
                    .catch(error => {

                       var errors = error.response
                        console.log(error.response)
                        ///IF EMPTY FIELDS FOUND///
                        if (errors.status == 403) {
                            //alert('somthing went wrong')
                            if (errors.data.message) {
                               vm.errorsPhone = true
                               $("#phone1").addClass("is-invalid");
                                vm.PhoneError = errors.data.message
                             toastr["error"](errors.data.message);

                //                  swal({
                //     title: "Oops!",
                //     text: "no alredy exist please login",
                //     icon: "error",
                //     button: "ok"
                // });
                                  showLoginForm();   
                            }else{
                               if (errors.data.error.phone) {
                                    vm.errorsPhone = true
                                     $("#phone1").addClass("is-invalid");
                                    vm.PhoneError = _.isArray(errors.data.error.phone) ? errors.data.error.phone[0] : errors.data.error.phone
                                    toastr["error"](vm.PhoneError);
                                    //alert(vm.PhoneError)
                                }

                            }

                        }
                        if (errors.status == 401) {

                              toastr["error"](errors.data.message);
                            }

                    });
        }`