Can't delete email from Junk/Trash folders
You seems to have an IMAP account, so Mail order server to delete those emails, but something goes wrong and the task is not completed. When Mail sincronizes with server again, those emails will show up again because were never actually deleted from server. You have to review the configurations of this account with your mail provider - probably request for a support. I'm afraid this is the first step. Chances are your configurations changed somehow (even some corrupted file) or the server were updated and your configurations are outdated.