Hi There,
Please manually add the excerpt to the school supply post:

After that add this code under functions.php file locates in your child theme:
function manually_added_excerpt_more( $excerpt ) {
	$excerpt_more = '';
	if( has_excerpt() ) {
        
	            $stack = x_get_stack();
			    if ( $stack == 'integrity' ) {
			      $excerpt_more =  ' ... <div><a href="' . get_permalink() . '" class="more-link">' . __( 'Read More', '__x__' ) . '</a></div>';
			    } else if ( $stack == 'renew' ) {
			      $excerpt_more = ' ... <a href="' . get_permalink() . '" class="more-link">' . __( 'Read More', '__x__' ) . '</a>';
			    } else if ( $stack == 'icon' ) {
			      $excerpt_more =  ' ... <a href="' . get_permalink() . '" class="more-link">' . __( 'Read More', '__x__' ) . '</a>';
			    } else if ( $stack == 'ethos' ) {
			      $excerpt_more =  ' ... <a href="' . get_permalink() . '" class="more-link">' . __( 'Read More', '__x__' ) . '</a>';
			    }
       
	}
	return $excerpt . $excerpt_more;
}
add_filter( 'get_the_excerpt', 'manually_added_excerpt_more' );
The code above will add the read more button to the posts which have the excerpt.
Let us know how it goes!