Hummingbird Says Gzip is Enabled, but GtMetrix Says Its Not


On a WP 4.7.2 multisite network running WP-FFPC, we have Hummingbird network activated and configured with Gzip turned on.

Hummingbird dashboard indicates it is active.

However running a scan on one of the subsites on the network indicates GZzi is NOT active.

What am I missing?