Message not staying in my sent folder

When I send an email, the email stays in my sent folder for a few seconds and then goes away

Hi Chad, what version of eM Client are you currently using on your computer, can you please check the exact release number in Help > About? What mail service are you using with eM client?

Are you using a POP or an IMAP account for synchronizing your items with the mail server

Are you able to replicate this behavior with all outgoing messages?