I submitted a personal endorsement to a friend recently and he received these same emails, which were puzzling considering that he had an application on file with Pilot Credentials for a year and then with the new system when it was implemented. A day or two later he received an interview invite, so it appears that you may have been selected for an interview but not yet invited, and the hiring dept is trying to get you to do a final update of your application.
Good Luck!