Error 525 SSL handshake failed With Cloudflare Origin Certificate is not working anymore

Hi, im getting Error 525 SSL handshake failed problem on only one site. Using same settings and 15 years Cloudflare origin cert + ca bundle, ssl mode full (strict) on all of my websites for years. Suddenly this popped up. Please help me. I deleted and readded ssl cert created from cloudflare origin cert. Still same. There was no problem for years. I couldn’t find the problem.
https://kuponla.com (now temporarily flexible mode for not losing more visitors, changed ns for host checking)

I’m not seeing any type of certificate on your site right now. Can you please put the origin cert back on so we can test?

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