<td><a href="http://www.maritime-sda-online.com/forums/ubbthreads.php?ubb=cfrm"><img SRC="/ubb/msdaol3.png"></td>
This line you created in your custom "HTML Includes" contains broken HTML, and is causing all of the following page items after it to become links.
https://www.ubbcentral.com/forums/u.../re-error-messages-what-to-do#Post262867You previously had added broken HTML, on your forum. The affect of your broken HTML would make everything that was clicked on, a link which would open in a new tab. After you fixed your broken HTML, your website's functionality was fixed.
Could it be that this is what your user is requesting?