GZip and Browser Caching disabled

GZip and Browser Caching are shown as deactivated. Though based on the Pingdom tools, leverage browsing caching is at 86% and GZip compression is shown as enabled at the checkgzipcompression.com

There is something that blocking Hummingbird to check the GZip and Browser Compression status.

The site has SSL installed which is temporarily deactivated, and the host is SiteGround. CloudFlare is not configured, SiteGround is not forwarding the DNS to CloudFlare

So far these actions have been done:
- Deactivated all plugins and switched to default WordPress theme
- Renaming .htaccess files.

SiteGround confirmed that no rules in .htaccess file aren't being overwritten by server settings.

Please advise