Tittle issue

I am using madara manga theme. After setting the manga title in the titles and meta settings, the names of the manga chapters do not appear on my site. In manga and manga sections, only the manga name is written. The template is ”%title% %sep% %sitename%”. In this way, only the manga name and the site name are written in a part of any manga. because the links to the manga chapters are ”/manganame/chaptaername”, so it does not recognize the chapter names. This problem did not occur in other SEO plugins. How can this problem be fixed?