photonexus and "read more" function

hello,
in my “photonexus” theme the read more function works by defaut for all the posts in category blog. Ok.
But in my website pictures in the read more extract does dot show. Only text is displayed. If you clik then on read more link, so picture and text is well displayed.
So my question is: why photos does not display on the “read more” preview?

have a look here at demo theme:
https://mtheme.imaginemthemes.com/wp/category/blog/

and my website:
https://jerome.pouysegu.free.fr/index.php/categorie/blog

and here is the code inside include\post_summary.php

<?php
$post_list_type=get_option(MTHEME . '_blog_summary');
if ( $post_list_type=="1" || $post_list_type==true ) {
	the_content();
	?>
	<div class="clear"></div>

	<div class="postinfo">
		<p><?php the_tags( __('Mots cl&eacute;s: ','mthemelocal'), ', ', ''); ?></p>
		<p><?php _e('Post&eacute; le ','mthemelocal');?> <?php the_time('j M Y (G:i)'); ?></p>
		<p><?php post_comments_feed_link('<img src="https://jerome.pouysegu.free.fr/wp-content/themes/photonexus/images/rss.gif"/ title="Suivez ce post grace au fil">');?></p>
		</div>				

	<div class="clear"></div>
	<?php
} else {
	the_excerpt();
	?>
	<div class="clear"></div>
	<div class="readmore">
		<a href="<?php the_permalink() ?>">
			<?php _e( 'Lire la suite..', 'mthemelocal' ); ?>
		</a>
	</div>

thanks for your help