My site with Wordpress infrastructure is not getting indexed on Google.

[LinkAkward]

Hello, I have a website called https://madrazemin.com. None of the pages of this site are being indexed in 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 codes that the title is like this. However, this link is only indexed on Google as "Zemin Etüdü Nedir" without mentioning the website's name. What is the reason for this and how can I fix it? Note: I am using the Yoast SEO plugin.