No you do not need any code in functions.php.
To fix your code, please call the repeater loop from within the main posts() loop here:
while ( have_posts() ) : the_post(); ?> <!--Because the_content() works only inside a WP Loop --> <div class="entry-content-page"> <?php the_content(); ?> <!-- Page Content --> </div><!-- .entry-content-page --> <?php endwhile; //resetting the page loop
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