Lets encrypt ssl showing instead of cloudflare ssl

I checked and see it too.
I believe that’s okay as far as Cloudflare uses different CA’s to issue Universal/ACM SSL certificates for domains using Cloudflare.

I might want you to check if you enabled below features at Cloudflare dashboard (Speed tab → Optimization and Network tab):

  • Auto Minify (HTML, CSS, JS), Rocket Loader, Brotli, HTTP/2, HTTP/3, 0-RTT …

May I suggest below article:

Useful posts from my colleagues on LCP to take a look at:

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