rkoller on "Always the same post of a custom post type is shown on a single page"

Hi i ran into an odd problem. I am running WordPress 3.8 and the relevant plugins are advanced custom fields (including the repeater field add on) and custom post types ui. I've created a custom field for projects and display them in a custom post type.

The custom field consists of:

1) title
2) Project summary picture (fieldname: pro_preview, field type: image)
3)Project description (fieldname: pro_description, field type: text area)
4) project services (fieldname: pro_services field type: repeater)
4.1) service (fieldnamen: pro_service_single field type: text)
5.) project images (fieldname: pro_images, field type: repeater)
5.1.) image (fieldname: pro_impressions, field type: image)

I have an overview page (template-projects.php) which lists all projects properly. If i mouse over one of the projects (e.g. running) the href shows localhost:8888/testsite/projects/running, or localhost:8888/testsite/projects/bike if i mouse over e.g. the bike project. but no matter which project i choose each time only one certain single other project is shown. no running no bike just lets name it nutrition. but i have no idea why. my single page is called single-projects.php . and also the adressbar is showing the correct adress like e.g. localhost:8888/testsite/projects/running in the case i've clicked running - but the content shows nutrition.

The query part on the single-projects.php page looks like that. For testing purpose i've only queried the title, description and services.

<?php
		$args = array(
			'post_type' => 'projects',
			'posts_per_page' => 1
		);
		$the_query = new WP_Query( $args );
	?>
	<? if ( have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post(); ?>
		<h3><?php the_title(); ?></h3>
		<p><?php the_field( 'pro_description' ); ?></p>
		<h4>Our services</h4>
		<?php if(get_field( 'pro_services' ) ): ?>
				<ul>
				<?php while( has_sub_field( 'pro_services' ) ): ?>
					<li><?php the_sub_field( 'pro_service_single' ); ?></li>
				<?php endwhile; ?>
				</ul>
		<?php endif; ?>
	<?php endwhile; ?>
		<?php wp_reset_postdata(); ?>
	<?php else: ?>
		<p>Something is gone wrong...</p>
	<?php endif; ?>

I am out of ideas what is going wrong here. :/ any hints are appreciated. best regards ralf