"Intermittent SSL Certificate Errors on iPhone When Accessing Website

I have registered an A record with Cloudflare pointing to Vercel’s IP and published the page at https://rakusai.site. I can access it without any issues from a Mac. However, when I try to access it from an iPhone, using either Chrome or Safari, it displays an “Invalid SSL certificate” error and won’t open. The status shows as “Host Error.” Sometimes, I am able to access the site, but often I cannot, and I’m not sure what the cause is.

What iOS version?

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