How hackers can see login form while I’m using clef?

Hello,

I’m using clef plugin to login, but still some hackers are trying to login by my site by typing “admin” in the login form! How’s this possible?

I completed disabled the login form in my clef settings, you can see this pic too – https://puu.sh/riQYt/3baac7f59a.png

You might ask me how I know tht some people are trying to login, i use wordfence plugin for security, so I’m getting mails like this – https://puu.sh/riR6C/c69db3dfb7.png