Archiv: Post won't show

Hello,

I have a problem with my archive page. When I click the link to the archive page I can see the overview with months, categories and so on. But when I click on a month, or a category, nothing happens, it just reloads the page. Maybe you want to have a look for yourself: https://www.trauerspielzeug.de (Archive link in the top left corner)

I’ve created a archiv.php with the following code:

<?php
/*
Template Name: Archives
*/
get_header(); ?>

<div id="container">
	<div id="content" role="main">

		<?php the_post(); ?>
		<h1 class="entry-title"><?php the_title(); ?></h1>

		<?php get_search_form(); ?>

		<h2>Archives by Month:</h2>
		<ul>
			<?php wp_get_archives('type=monthly'); ?>
		</ul>

		<h2>Archives by Subject:</h2>
		<ul>
			 <?php wp_list_categories(); ?>
		</ul>

	</div><!-- #content -->
</div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

afterwards I created a new empty page and gave it the template from archiv.php.

What can I do?