all buttons take you back to the home page

I have a WordPress site that worked well before I updated it. I have replaced all of the pages, changed themes (multiple times), added an .htaccess file as suggested in another post, reset the home page, disabled all plugins, and when I view my site, all buttons take you back to the home page. nchsclass1974.com

Help!!!

[Moderator note: Please don’t duplicate your thread]