SSL FULL (strict) "certificate issuance" after 24h & Let's Encrypt

Hi, I’ve two issue
First of all, Recently I re-generate my SSL certificate but after 24h had the same status “certificate issuance”.
2° Problem I’ve re-generate it because on my website I use let’s encrypt and I’ve followed the guide for use Cloudflare CDN & let’s encrypt certificate. My settings are Universal SSL disable and Full (Strict) certificate, for 1hours it works but after I get the " mismatch error ".
Can someone help me?

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