Pages are forgettting their Template Names

Hej,

I recently coded my ownn theme for this site: grupo-berlin.de. Nearly every Site is a Custom Template with

<?php
/**
Template Name: Various Names
 */
?>

at their top.

Every template is named: radscheit-XXX.php
When I setup pages with one of my templates it works fine. When I visit the same page a few hours later the page forgot its template name and nothing but header and footer is displayed. I’m using Advanced Custom Fields and WPML.

All of my templates are very similiar:

<?php
/**
Template Name: Leistungen
 */
?>

<?php get_header(); ?>

<div class="container" id="contentbereich">

<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

	<?php if (get_field('main-headline') && get_field('2nd-headline') && get_field('copy-text') && get_field('grafik')): ?>
	<div class="row">
		<div class="col-md-10 col-md-offset-1">
			<h1 class="uberschrift-grey"><?php the_field('main-headline'); ?></h1>
		</div>
	</div>
	<div class="row">
		<div class="col-md-8 col-md-offset-2">
			<h3 class="halbfett">
				<?php the_field('2nd-headline'); ?>
			</h3>
			<div class="row">
				<div class="col-md-4">
					<?php the_field('copy-text'); ?>
				</div>
				<div class="col-md-8">
					<img src="<?php the_field('grafik'); ?>" class="img img-responsive"/>
				</div>
			</div>
		</div>
	</div>

	<?php else: ?>
		<p class="rahmenoben"><?php _e('Es sind keine Posts hinterlegt.'); ?></p>
	<?php endif; ?> 

<?php endwhile; else: ?>
	<p class="rahmenoben"><?php _e('Es sind keine Posts hinterlegt.'); ?></p>
<?php endif; ?>

<?php get_footer(); ?>

Does anyone have an idea?

Thanks in advance