Trouble with Hummingbird

The plugin is telling me to contact you. I installed it on my dev site (mathsolutionsdev.com) and it works just fine. However, on the live site, it's having trouble enabling gzip compression, giving the following error:

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.

also, having trouble with Browser Caching:

Browser Caching is not working properly:
- Your server may not have the "expires" module enabled (mod_expires for Apache, ngx_http_headers_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 do have WP Super Cache active, however. Maybe that's the issue