I noticed that Cloudflare announced in blog that you have changed partners in the Chinese mainland: https://blog.cloudflare.com/upgrading-the-cloudflare-china-network/
But today, my friend encountered Yunjiasu’s DDoS five-second check protection page, and this website uses Cloudflare instead of Yunjiasu.
He has been unable to pass the verification and repeatedly loads the protected page. After opening the DevTools of the browser, he found that he was visiting the page of Yunjiasu.
If Cloudflare no longer cooperates with Yunjiasu, please check whether there are still relevant parameter settings.
And delete the previously written help documents: