The template tag <?php the_title(); ?> generates the title specific to each page and post.
Open single.php and page.php and remove the <h2> you just added. Find the other <h2> that contains the the_title() template tag. Then add the archive_head class, so it looks something like this:
PHP Code:
<h2 class="archive_head"><?php the_title(); ?></h2>
The point of the two different headings is to distinguish what "section" you are in from the post titles, but it looks like what you want is to make them look alike.
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