Hummingbird Gzip Compression not enabling

I cannot enable Gzip compression in Hummingbird. It says mod_deflate is not enabled. But I checked with my host and they mentioned mod_deflate module is enabled.
Moreover, related modules like mod_headers and mod_setenvif are enabled as well. I have tried a plugin/theme conflict test which didn't help. Tried a default htaccess with WordPress and Hummingbird rules, didn't help either. No debug logs were generated too.
Please advice.