All in One Seo Pack wierd issue

I am facing a wierd issue with All in One Seo Pack plugin.

I have set the home page title and the titles of the individual posts on each edit posts section.

But wherever I click, whether posts or pages, only the home title is showing up.

Here is the URL of the website..

https://www.golfworkoutprogram.com/

All posts have unique titles, but the same home page title shows on all the posts.

Can anyone tell me whats wrong with it. I have also upgraded WordPress as well as this plugin to the latest version.

wp_head also exists in the header.

Thanks in advance.