I’m not sure if I’m in the right category so feel free to move this post if not! I have some sites that were working fine until randomly they stopped and gave this error. All certificates are issued by lets encrypt(using certbot on Ubuntu) or by Cloudflare. I have my SSL on full and have HSTS enabled and this hasn’t caused any issues so far. On the error page it says “Subject: raa.namecheap.com” & “Issuer: Sectigo RSA Domain Validation Secure Server CA”. I dont get why the subject is Namecheap when thats my registrar and I use Cloudflare for DNS. I checked to see if the sites were playing up or the DNS records were broken so I tried pinging all my sites and they all replied successfully. Does anyone know how to fix this?