Naah, only plugins I have are those installed by simplex itself
Well, apparently the_title needed FALSE as a third parameter
<?php if(! is_singular()){ ?><a title="<?php the_title('', '', FALSE); ?>" href="<?php the_permalink(); ?>" class="readon readmore readmore-link">Read more...</a><?php } ?>
Usage
<?php the_title( $before, $after, $echo ); ?>
Parameters
$before
(string) Text to place before the title. Defaults to ''.
$after
(string) Text to place after the title. Defaults to ''.
$echo
(Boolean) Display the title (true) or return it for use in PHP (false). Defaults to true.