HTML Gzip compression is not working but deflate module is enabled on the server

I’ve installed Hummingbird on my site and I’m getting this error message as per HTML Gzip compression, but the deflate module is currently active on the server (I have other sites installed on it on which I run HB with no errors):

Gzip is not working properly:

– Your server may not have the “deflate” module enabled (mod_deflate for Apache, ngx_http_gzip_module for NGINX).

– Contact your host. If deflate is enabled, ask why all .htaccess or nginx.conf compression rules are not being applied.

If re-checking and restarting does not resolve, please check with your host or open a support ticket with us.