H1 tag issue?

Hi, this is one of my featured (with image) post which got issue, https://www.akusihat.com/lingzhi-ganoderma-frequent-asked-questions-faq/

But, normal post, it is fine – https://www.akusihat.com/shuang-hor-the-leader-in-lingzhi-biotechnology/

I just want to adjust featured post to be just like normal post.

Any reasons why?

The changes I did is at content-single.php

<?php if ( has_post_thumbnail() && 'post' == get_post_type() ) {?>
        <header class="entry-header">
            <?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
        </header><!-- .entry-header -->
    <?php } else { ?>
        <header class="entry-header">
            <?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
        </header><!-- .entry-header -->
    <?php } ?>