Problem to activate Hummingbrid Zip

Hello

1) Please go to https://www.giftofspeed.com/gzip-test/ and enter for test my domaine "http://polenordmagic.fr/" - You will see that Gzip is activate on website

2) Inside https://polenordmagic.fr/wp-admin/admin.php?page=wphb-gzip to setup the plugin Hummingbrdi I have this Message :

gzip is not working properly:

- Your server may not have the "deflate" module enabled (mod_deflate for Apache, ngx_http_gzip_module for NGINX)
- Another plugin may be interfering with the configuration
If re-checking and restarting does not resolve, please check with your host or open a support ticket with us.

I have only 3 plugin in my website WPMU DEV and Hummingbird and visual Composer.

Best Regards,
Pierre QUINTANA