Question about SEO titles

Hi,

I would like to ask you about an issue that i have on my website http://www.webfish.gr where i use your SEO plugin.

At each of my pages, the name of them on browser’s tab is appeared like these for example :

Webfish | Η Εταιρεία | Webfish

Webfish | Portfolio | Webfish

e.t.c

Why does it happen? At snippet preview of my plugin’s general settings, i just see Portfolio | Webfish or Η Εταιρεία | Webfish for example.

Is there a special setting for this to avoid my company’s name appearing as double?

https://wordpress.org/plugins/wordpress-seo/