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!