Cannot migrate site away from CloudCannon

I wanted to stop using CloudCannon and changed the DNS records in the CloudFlare dashboard to not point to CloudCannon.

Now, when enabling proxying throug CloudFlare, it serves the CloudCannon pages.
When I set it to DNS only, it serves the intended pages.

I tried clearing the cache, but it’s still the same.

Site in question: https://reki.wtf.
There’s two ways to discern what page is served: the CC pages, have a transparent icon on the top left of the page and the header cc-stable-domain is set to grape-eraser.cloudvent.net

Is there anything else I can do on my end? Thanks for any help you can give.

Ask CloudCannon to completely remove your domain from their system as well as from Cloudflare. That should release it so you can use it on your own.