Performance Browser Caching Hummingbird Pro

I am using Hummingbird Pro in my Multisite Network to check and enhance sites performance.

I have also enabled Browser Caching with resources expiry set to 8 days in cloudflare as recommended in the plugin settings.

It is working fine for main site in multisite.

But this effect is not showing in sub sites.

When I test performance of sub site, it shows that images and other resources expiry is not specified.

Please explain how to resolve this.

Thanks