XML : Authorize.net CIM API Duplicate transactions

Any help here would be appreciated.

As of 3 days ago our website began randomly authorizing transactions twice on authorize.net CIM transactions with the exact same details. Since this came out of the blue without any changes on our end, I am trying to set duplicateWindow or x_duplicate_window to stop the second transaction since I don't know where it is coming from (it seems to have no pattern as to when it happens).

Below is an example of the xml that is being sent that doesnt seem to work. Again, any help would be appreciated.

  <createCustomerProfileTransactionRequest xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd">  <merchantAuthentication>      <name>ACCOUNT_ID</name>      <transactionKey>TRANS_KEY</transactionKey>  </merchantAuthentication>  <refId></refId>  <transaction>      <profileTransAuthOnly>          <amount>5.97</amount>          <customerProfileId>CUST_PROFILE</customerProfileId>          <customerPaymentProfileId>PAY_PROFILE</customerPaymentProfileId>          <order>              <invoiceNumber>4032486</invoiceNumber>              <description></description>              <purchaseOrderNumber></purchaseOrderNumber>          </order>      </profileTransAuthOnly>  </transaction>  <extraOptions><![CDATA[x_duplicate_window=10]]></extraOptions>