My Test Result and Cache static content F

First Byte Time = A
Keep-alive Enabled = A
Compress Transfer = A
Compress Images = A
Cache static content = F
Effective use of CDN = yes

My Website wpfreepaid.com

Similar occurs to me…
But in my case, running Chrome locally show me that the restarting the page all the assets load from memory/disk cache, as its headers indicate.
Should it be caused by a old version of the browser running the tests?

Cheers,
Maat

I have checked my website - Diamond Story
Here are the test results of my website - https://www.webpagetest.org/result/191105_PT_ceaf71155b55bca54ba4bdfcbb6ec8b4/