ikaring

In your theme’s style.css, there is float: left on #comments .comment-body.
So easiest way is just add this css with a custom css plugin.

#comments .comment-body {
  float: none;
}

Hi.
Pls check developer tools of your browser if there are some javascript errors or not.
If you can provide the url, that would be easier.

Usually, SASS files are compiled to a css file beforehand, and load the css file to pages.
So be sure to enqueue parent theme’s style.css or include it to child theme’s style.css.

https://codex.wordpress.org/Child_Themes

OK.
Then, you need to check developer tools of browser yourself to see why that specific css rule is not applied to the titles.
I doubt if that css (not SASS) is read though.

Does parent/ancestor element of article has .block1_grid class?
It’s outside of your code snippet shown above.

Just wrap whole block inside the article with a tag, instead of wrapping thumbnail image only.

<article id="post-<?php the_ID(); ?>" <?php post_class( 'col-md-6 col-sm-12' ); ?>>
<a href="<?php echo esc_url( get_permalink() ); ?>" title="<?php the_title(); ?>">
  <div class="entry-thumb">
      <?php
      if ( has_post_thumbnail( ) ) {
          the_post_thumbnail( 'codilight_lite_block_2_medium' );
      } else {
          echo '<img alt="'. esc_html( get_the_title() ) .'" src="'. esc_url( get_template_directory_uri() . '/assets/images/blank325_170.png' ) .'">';
      }
      ?>
      <?php
      $category = get_the_category();
      if($category[0]){
          echo '<a class="entry-category" href="'.get_category_link($category[0]->term_id ).'">'.$category[0]->cat_name.'</a>';
      }
      ?>
  </div>
  <div class="entry-detail">
      <header class="entry-header">
          <?php the_title( sprintf( '<h2 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' ); ?>
          <?php if ( 'post' === get_post_type() ) codilight_lite_meta_1();?>
      </header><!-- .entry-header -->

      <div class="entry-excerpt">
          <?php echo codilight_lite_excerpt(120); ?>
      </div><!-- .entry-content -->
   </div>
</a>
</article><!-- #post-## -->

Since your theme is not resistered in WordPress.org theme directories, you’d better ask theme author.

Hi.
You should check your theme template.
It should be something like main.php used for this page.