When logged in as Admin (or any of the other admin level accounts) I can’t see all of my clients. Users: 20 at the top but only 8 showing in the panel. Through the server’s terminal, I can see all 20 accounts.
It’s a pain to check that file when all the users are xxxUSERxxx but, I suppose you can’t view the users that don’t have assigned a mail.
How did you create those users without mail? When you create a normal user, Hestia forces to use a mail address. If you add a mail address to those “normal” users, you should see them.
Note: when I speak of normal users it is to differentiate them from ftp users.