page-civiform.php

<?php
/**
* Template Name: Civi Form Page
 *
 * 1/3, 2/3 page template
 *
 * @package MRG Theme
 */

get_header(); ?>
	<header class="entry-header">
		<h1 class="entry-title"><?php the_title(); ?></h1>
		<p class="intro-text"><?php echo the_field('intro_text'); ?></p>
	</header><!-- .entry-header -->
<?php if( get_field('left_third_content') ): // if we can find this field, we're using content from page-civiform.php
?>
	<div id="primary" class="content-area">
		<div class="left-third">
			<?php echo the_field('left_third_content'); //this is an ACF WYSIWYG editor field 
			?>
		</div>	
		<main id="main" class="site-main shortcoded" role="main">

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

				<?php get_template_part( 'content', 'page' ); // site admins use native WP page content editor to insert shortcode
				?>				

			<?php endwhile; // end of the loop. ?>

		</main><!-- #main -->
	</div><!-- #primary -->

<?php else: // if we can't find 'left_third_content', we must be on a Civi-generated page; don't include div.left-third as it will be empty
?>
<div id="primary" class="content-area">
		
		<main id="main" class="site-main" role="main">

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

				<?php get_template_part( 'content', 'page' ); ?>				

			<?php endwhile; // end of the loop. ?>

		</main><!-- #main -->
	</div><!-- #primary -->
<?php endif; ?>
<?php get_footer(); ?>

http://civicrm.stackexchange.com/questions/8904/wp-base-page-not-working-as-expected