Chris Huff

Facebook uses the image specified as the og:image. If no og:image is specified, it tries its best to pick the image (usually the first one in the content) that best represents the page being shared. Of course, when an og:image is not specified, Facebook often gets it wrong.

So the best way is to specify an og:image. Some plugins will do this using the featured image. Some will allow you to specify an og:image for each post. I use SEO Ultimate for this purpose.

What’s the page you’re trying to share? I could take a look at the code and try to determine the cause.

Look in content-single.php

By the way, when you post code, put it between backticks in order to preserve the code, so that none get stripped away.

Try this. In the template-parts/content.php file, change this:

echo '<div class="post-thumbnail">';
the_post_thumbnail( 'large-thumb' );
echo '</div>';

To this:

echo '<div class="post-thumbnail"><a href="' . get_permalink() . '">';
the_post_thumbnail( 'large-thumb' );
echo '</a>';
echo '</div>';

When you post code here on the WordPress forums, make sure you put your code between backticks (highlight the code and click “code” above the textarea). That way none of the code is stripped out.

Since your single.php uses get_template_part(), we need to look into another file to find the featured image code. Does your theme have a loop-single.php? Or maybe just loop.php? Post its code here, and it should have the featured image code in it.

Take out all the code we added so far, and just try this instead:

function add_metaboxes(){
    add_meta_box('postimagediv', __('Featured Image'), 'post_thumbnail_meta_box', 'post', 'side', 'high');
}
add_action( 'add_meta_boxes', 'add_metaboxes' );

This will attempt to simply move the default featured image meta box to the top, without removing it first.

Try this.

<?php
if(get_field('prevention')){
    $prevention_array = array();
    while(has_sub_field('prevention')){
        $prevention_array[] = get_sub_field('prevention_method');
        }
    $i = count($prevention_array);
    if($i==1){
        the_sub_field('prevention_method');
        }
    else{
        echo '<ul>';
        foreach ($prevention_array as $prevention_method) {
            echo '<li>' . $prevention_method . '</li>';
            }
        echo '</ul>';
        }
    }
?>

I think the problem was that I was trying to create an array with the_sub_field() when I should have used get_sub_field(), so that it didn’t immediately echo as output. Let me know if that works.