Jetpack Top Posts Widget – Image problem

Hi,

I have problem with post images in top posts widget by Jetpack. Instead of featured image, widget is displaying some random picture from each post. I think that my theme causes this.

My theme contains also popular posts widget, however it is based on number of comments, not views. Thats why I use Jetpack. This is a widget code from my theme and it works correctly as it displays featured images near posts names.

ul class="post-thumb widget_posts clearfix">
		<?php while ($query->have_posts()) : $query->the_post();  ?>

            <li class="item">

                <?php if($show_thumb == 'yes'): ?>
                    <div class="thumbnail"><a>"><?php the_post_thumbnail() ?></a></div>
                <?php endif; ?>

And if I understand it correctly, I am supposed to edit this code in Jetpack Widget plugin:

case 'list' :
		case 'grid' :
			wp_enqueue_style( 'widget-grid-and-list' );
			foreach ( $posts as &$post ) {
				$image = Jetpack_PostImages::get_image( $post['post_id'] );
				$post['image'] = $image['src'];

However, I’m not a developer, so I need a help.

Thanks