Why is the Open Graph title the same for every webpage?

WPSSO Core uses the WordPress wp_title() and get_the_title() functions to determine the title of webpages. These WordPress functions are also used by theme templates and other plugins to retrieve the title of the current webpage, or any page / post ID.

WordPress provides filters for these functions — a way for plugin authors to modify the title for various purposes — and these filters are often used by SEO plugins, for example, to modify / standardize the webpage titles. See http://codex.wordpress.org/Plugin_API/Filter_Reference/wp_title for more information.

If your Open Graph and webpage titles (shown in the web browser’s title bar and tabs, for example) do not show the correct information — perhaps always showing your website name, and not the current post / page title — then perhaps a plugin or theme has “hooked” into the wp_title() filter to manipulate its output. By default, the wp_title() function should return the post / page title, which changes from one post / page to another.