Quite urgent : Font-weight behavior…

Hello,
On my site, I use Raleway font, native in Enfold. I’d like to use extrabold and black font weight.
I’ve put this in my child theme functions.php file : cf, your documentation.

add_filter
( 'avf_google_heading_font', 'avia_add_heading_font');
function avia_add_heading_font($fonts){
$fonts['Raleway'] = 'Raleway:400,700,800,900';
return $fonts;}
add_filter
( 'avf_google_content_font', 'avia_add_content_font');
function avia_add_content_font($fonts){
$fonts['Raleway'] = 'Raleway:400,700,800,900';
return $fonts;}

In the editor, I see the difference between the font-weight 700, 800, 900, cf print srcreen1 : yesyouweb.com/img/1.JPG
Online, the 3 sentences are the same, cf print screen2 / https://yesyouweb.com/img/2.JPG
What’s wrong?
I’ve duplicated the block in a test page, URL attached.

Tx for your help !