Deleted Folder Keeps Coming Back

Hi, I'm a noob and I been using Freenas for more than a year and so far I didn't encounter any problem.
I need some help, it's not really a problem but it's annoying.
I created a folder before.
I tried to delete that folder now, the problem is it will keep coming back.
And I just noticed, there are hidden files(.cshrc, .login, .login_conf, .mail_aliases,
.mailrc, .profile, .rhosts, .shrc) inside that folder.
My noob question is how can I delete that folder so it won't come back and why that...

Deleted Folder Keeps Coming Back