eM Client 7.0.26134 - Email went missing after moving into Junk Email folder

My email domain is @outlook.com and was using eM Client 7.0.26134, browsing inbox, drag an email into “Sent” folder by mistake, then drag the same email into “Junk E-mail” folder by mistake again (due to faulty mouse in double click). The said email would then go missing. Tried with all folder search still could not locate the same. Any idea how to locate the missing email? Thanks.

* I have tried repeating the above steps with other emails and the same thing happened( all went missing).