This may happen if a user edits the appeal mailing after the process has already been ran. After an appeal mailing has been ran if you go into the mailing and edit a letter Altru will show a message when trying to save the changes. The message will read: When you edit an activated mailing, it no longer appears in the history of its recipients. To retain the mailing in recipients' history, copy the mailing and edit the new mailing as necessary. Are you sure you want to edit the mailing. 

If you click yes on this screen Altru will remove the history of this mailing on the recipients' record.

If you need to edit the mailing for a new run, but want to keep the history of the mailing on the recipients' record you will need to copy the appeal mailing and make your changes there. To copy an appeal mailing you can follow these steps.