On single post template i cannot remove author box for the unregistered users

I have search all the templates but i cant find a template that has authox bow with author name after article and when im editing a single post template i dont see any wthor box, yet when an unregistered user navigate to a site it displays an author box
How i can remove it? it should not be so hard.
i have also tried to remove it with css with no luck with this code
.tdb_single_author_box{
visibility: hidden !important;
}
This is the page with the problem https://cityface.gr/news-2/%ce%b5%ce%ba%ce%ba%ce%bb%ce%b7%cf%83%ce%b9%ce%b1/%ce%b4%ce%b5%ce%af%cf%84%ce%b5-%ce%b1%cf%80%cf%8c-%cf%88%ce%b7%ce%bb%ce%ac-%ce%b5%ce%bd%cf%84%cf%85%cf%80%cf%89%cf%83%ce%b9%ce%b1%ce%ba%ce%ac-%cf%80%ce%bb%ce%ac%ce%bd%ce%b1-%ce%b1%cf%80%cf%8c-%cf%84/

• This topic was modified 4 years by cityface.
• This topic was modified 4 years by cityface.