CDN cloudflare not fully functional with wp fastest cache

I am using wp fastest cache on my website combined with cloudflare CDN. wp fastest cache works great except for the fact that when I check the page on GTmetrix it says that all the images and these links are not on CDN:

/cache/wpfc-minified/c679790d1f46234580e122479156b78a/1521282338index.css
cache/wpfc-minified/47d0e14d6858322dfe25634c63adb091/1520928937index.js

Is this a cloudflare thing or a wp fastest cache thing? Anyone knows a fix?