Authorize net not giving card type for few Discover testing cards

[eliyasbaby]

var request = new getCustomerPaymentProfileRequest();
            request.customerProfileId = customerProfileId;
            request.customerPaymentProfileId = paymentProfileId;


            // instantiate the controller that will call the service
            var controller = new getCustomerPaymentProfileController(request);
            controller.Execute();
 var response = controller.GetApiResponse();

            if (response != null && response.messages.resultCode == messageTypeEnum.Ok)
            {                
                if (response.paymentProfile.payment.Item is creditCardMaskedType)
                {
                    exisitngCard = new CardDetails {
                        MaskedCardNumber = (response.paymentProfile.payment.Item as creditCardMaskedType).cardNumber,
                        ExpireMonth = (response.paymentProfile.payment.Item as creditCardMaskedType).expirationDate,
                        CreditCardType = (response.paymentProfile.payment.Item as creditCardMaskedType).cardType
                    };
                }
            }

On getCustomerPaymentProfileRequest, saved cards details for few discover card numbers not retuning card type

card details
Number: 6011111111111117
Expiration date : 01/34
cvv:123

Environment : sandbox