The conflict with the popular plugin Shortcodes Ultimate

Author of the plugin Shortcodes Ultimate found a solution

function vanokhin_disable_rlightbox_where_su_boxes( $posts ) {
	if (
		empty( $posts )
		|| ! function_exists( 'Responsive_Lightbox' )
		|| ! function_exists( 'su_get_shortcode_prefix' )
	) {
		return $posts;
	}
	foreach ( $posts as $post ) {
		if ( ! has_shortcode( $post->post_content, su_get_shortcode_prefix() . 'box' ) ) {
			continue;
		}
		remove_filter( 'the_content', array( Responsive_Lightbox()->frontend, 'add_lightbox' ) );
		break;
	}
	return $posts;
}
add_action( 'the_posts', 'vanokhin_disable_rlightbox_where_su_boxes' );

So, you will find the problem faster, because he has already identified it.

This is not a solution but a workaround i think.
But we’ll have that issue in mind.