Thank you for your response. I am sorry for not being descriptive enough. On our categorical pages we removed the comments and dates of each post and replaced it with a bit of code that pulls the sub heading and made it display under the image. After thorough examination and trial and error, we found that this code
<?php the_excerpt(); ?> was pulling out a bit of text from each post. However not every post had text that the code could pull out. We commented out the code and replaced it with the previous code so that every post has a preview description. Using this line of code
<?php echo get_post_meta(get_the_ID(), 'mh-subheading', true); ?>.
We have seemed to solve our problem. Thank you for your time.