[Plugin: Co-Authors Plus] Template tags create duplicate entries of authors

Can you post the code you’re using into Pastebin and share here?

Here it is, if I did this correct:
<script src=”https://pastebin.com/embed_js.php?i=6Fpagkw3″></script&gt;

function twentyeleven_posted_on() {

 if ( function_exists( 'coauthors' ) ) {
	printf( __( '<span class="sep">Posted on </span><a href="%1$s" title="%2$s" rel="bookmark"><time class="entry-date" datetime="%3$s" pubdate>%4$s</time></a><span class="by-author"> <span class="sep"> by </span> <span class="author vcard">', 'twentyeleven' ),
		esc_url( get_permalink() ),
		esc_attr( get_the_time() ),
		esc_attr( get_the_date( 'c' ) ),
		esc_html( get_the_date() )
	);
	echo coauthors_posts_links().'</span></span>';
  }
else
	{
	printf( __( '<span class="sep">Posted on </span><a href="%1$s" title="%2$s" rel="bookmark"><time class="entry-date" datetime="%3$s" pubdate>%4$s</time>	</a><span class="by-author"> <span class="sep"> by </span> <span class="author vcard"><a class="url fn n" href="%5$s" title="%6$s" rel="author">%7$s</a></span></span>', 'twentyeleven' ),
		esc_url( get_permalink() ),
		esc_attr( get_the_time() ),
		esc_attr( get_the_date( 'c' ) ),
		esc_html( get_the_date() ),
		esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
		esc_attr( sprintf( __( 'View all posts by %s', 'twentyeleven' ), get_the_author() ) ),
		sprintf(get_the_author() )
	);  }
}

You might want to try something like this instead:

function twentyeleven_posted_on() {
echo 'Posted on <a href="' . get_permalink() . '">' . get_the_date() . '</a> by';
if ( function_exists( 'coauthors_posts_links' ) )
coauthors_posts_links();
else
the_author();
}

It removes some of the markup so you might want to add that back in if you need it.

Thanks, that did the trick.

Great to hear ??

I think this problem is similar to mine. Can someone help me out. Here are the details.

I used the co-author plug-in for this article and manage to setup the authors info below the article. Here’s the link:
https://www.asiapathways-adbi.org/2012/03/reforming-asias-trade-in-services-will-help-human-development/

But, when you click the archive link of the author, it display also the co-author bio instead of only one bio.

See below the code. Any help is deeply appreciated.

<?php
		}
	}
}

/*-----------------------------------------------------------------------------------*/
/* Author Box */
/*-----------------------------------------------------------------------------------*/

if ( ! function_exists( 'woo_author' ) ) {
	function woo_author() {
		// Author box single post page
		if ( is_single() && get_option( 'woo_disable_post_author' ) != 'true' )
			add_action( 'woo_post_inside_after', 'woo_author_box', 10 );
		// Author box author page
		elseif ( is_author() )
			add_action( 'woo_loop_before', 'woo_author_box', 10 );
	}
}

/*-----------------------------------------------------------------------------------*/
/* Single Post Author */
/*-----------------------------------------------------------------------------------*/
if ( ! function_exists( 'woo_author_box' ) ) {

	function woo_author_box() {
		global $post;
		$author_id=$post->post_author;
	?>

	<?php
		$i = new CoAuthorsIterator();
		while($i->iterate()){
	?>

	<div id="post-author">
	<div class="profile-image">
		<?php echo get_avatar( get_the_author_meta('ID'), '80' ); ?>
	</div>

	<div class="profile-content">
		<h4>
		<?php printf( esc_attr__( 'About %s', 'woothemes' ), get_the_author('description', $author_id) ); ?></h4>
		<?php echo get_the_author_meta( 'description'); ?>

		<?php if (is_singular()) : ?>

		<div class="profile-link">
			<a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>">
				<?php printf( __( 'View all posts by %s <span class="meta-nav">→</span>', 'woothemes' ), get_the_author( 'display_name', $author_id ) ); ?>
			</a>
		</div><!-- #profile-link -->
		<?php endif; ?>

	</div>
	<div class="fix"></div>
	</div>

	<?php } ?>

<?php
	}
}

https://www.ads-software.com/extend/plugins/co-authors-plus/