WordPress srcset: how to and chrome issue

[axew3]

Code: Select all

function w3all_ht_custom_image_srcset( $sources, $size_array, $image_src, $image_meta, $attachment_id ){

	$w = get_custom_header()->width;

// srcset val
		$sources[$w] = array(
				 'url'        => 'myurlimage.jpg',
				 'descriptor' => 'w',
				 'value'      => $w,
		);
			return $sources;
		
	}
	add_filter( 'wp_calculate_image_srcset', 'w3all_ht_custom_image_srcset', 10, 5 );
	

the problem is, on chrome, the filter seem to be applied not only to header image, as correctly done by all others browsers, but also, if for example on post gallery, to all others gallery images, that are appearing in this way:

ScreenHunter_69-Jul.-06-10..jpg (50.61 KiB) Viewed 1028 times

instead than as on others tested browsers, in the correct way:

ScreenHunter2.jpg (12.02 KiB) Viewed 1028 times