Welcome to the Q&A Forum

Ok, I think I see what you're saying, but it doesn't seem to have anything to do with Google. If I go directly to a page like this one (even incognito): https://www.shelfstuff.com/book-shelf/books/where-the-watermelons-grow/?id=9780062665867 ...and then go to the home page, I still see the book title in the browser tab. The title tag itself looks ok, but the sight is highly dynamic. I'm guessing this is some kind of strange JavaScript rewrite or something else happening in your code. Unfortunately, it would take an in-depth knowledge of your site code to sort out why. Is the site using AJAX or something similar? Definitely seems like pages are being created dynamically and not loading in a typical way.