utnalove on "WP doesn't read anymore the_post_thumbnail - and it doesn't use the resized thum"

Hi, it all worked fine for years. But in the last post it stopped working.

In wp-admin/options-media.php there are different sizes.

I use and used to upload images 600px width. The large image maximum width is 560px. The thumbnail/featured images have always been 560px width thanks to this:

<?php if ( has_post_thumbnail() ) {the_post_thumbnail( 'large', array('class'=>'post_thumbnail_common', 'alt' => get_the_title() , 'title' => get_the_title(), 'itemprop'=>'image' ));} ?> 

<?php the_content(); ?>

But in the last post it didn't work. Wordpress instead of choosing the image justyna-05-560x373.jpg it takes justyna-05.jpg

You can see it here and here.

Why that?