Form Becomes xml on 2nd Submit

Greetings,

I've run into an issue with a Livecycle form that has multiple people interacting with it.

I have a Submit button that sends the PDF to a specific department email address. The department loads the form to Sharepoint 2013. After that another person access the form from Sharepoint, completes another area of the form and presses the Submit button. However the email that is generated now has an xml file, not a PDF.

Has anyone else had this issue? Does anyone have an explanation/solution?

Thanks for any help you can give,

-m