Gzip Enabled. Gzip Is Not Working Properly

Hi:

When I enable Gzip Compression I get these two messages. "Gzip Enabled" and "Gzip Is Not Working Properly". I have gone through the checks and can not find the issue. Hoping you can help?

This website is a couple months old and recently started running really slow. I installed Hummingbird to see if it could help be determine what the problem was.

I have granted support access.

Thank you,
Loren