Why does Google define grav cms at the end of the title?

Hello friends, I found that google search sees the main part of the pages with a wrong ending in the title. In order to make sure that simple, click on this link:


You will see that at the end there is this ending “- Grav CMS - SDstudio.top” which is not where and how is not specified in the site settings.
I just can’t get away from where the search could take this data which is very bad for the site promotion.