pages created with .bs_model at the end of the url

Hi.
Many pages are created with the .bs_model added to the url, which doesn’t exist and cause 404 response.

This occur in several places on header.php :
for example:

         <div class="right-nav"> 
            <?php $blogus_menu_search  = get_theme_mod('blogus_menu_search','true'); 
              if($blogus_menu_search == true) { ?>
                <a class="msearch ml-auto" href="https://projectdmc.org/support/topic/pages-created-with-bs_model-at-the-end-of-the-url/.bs_model" data-bs-toggle="modal"> <i class="fa fa-search"></i> </a>
            <?php } ?>
          </div>

Can you solve this?

The page I need help with: [log in to see the link]