Clicking on a subtopic in one page redirects to the main forum on another page
I have a page that houses my main forum (The parent - On Main Forum Page). Note: THe Main Forum Page is not my Home Page. Under my main forum I have several subforums (Forum A, Forum B, etc....the children). I have the short code for these subforums in individual pages ( Page A for Forum A: ). My problem is that when I click on the forum to add a topic in subforum Forum A, it redirects to the Main Forum Page and the Main Forum. How do I prevent this from happening and keep the user adding a Topic to Forum A on Page A?
Please note: The forum base URL is one for all. All shortcodes are only designed to show to the first list, but paginations and links go to the main forum page with main forum slug.
In other words, pages with custom shortcodes are not separate forums, they are just a list of current view but all content is linked to the main forum page and being opened under Base Forum URL/Slug.
To me until recently it was seen in the shortcode page, now not anymore ... how is it possible?