My website based on Wordpress is not getting indexed on Google.

[LinkAkward]

Hello, I have a website called https://madrazemin.com. None of the pages on this site are being indexed by Google with the site name. For example, when you enter this link https://madrazemin.com/zemin-etudu-nedir, the title appears as "Zemin Edüdü Nedir - Madra Zemin." You can see from the page source code that the title is like this. However, when indexed by Google, this link is only shown as "Zemin Etüdü Nedir," without the website name. What is the reason for this and how can I fix it? Note: I am using the Yoast SEO plugin.