Docusign security breach of customer private info?

Recently completed DocuSign doc and then an email coming to my gmail account stating the forms have been completed also had PDF attachments that had been provided inside the secure DocuSign application with personal ID info such as Driver’s License, Military Dependent ID and the completed form with SSN info.  I contacted Newtek Bank for whom the DocuSign forms were completed to establish a joint owner for an account.  They stated they have no control over 3rd party applications (i.e., DocuSign) used for this purpose.  I asked if they would provide a picture of a credit card, SSN card, etc., as an attachment to an unsecured email, they said of course not.  So why is this private ID info showing up as PDFattachment’s to an unsecured email from Josh xxx via DocuSign?