Connecting the domain to two panels without changing dns

My domain was connected to cloudflare and it was connected from the DNS section of our IP server, and now it is connected to another IP, and according to our checks, it seems that another person has connected the domain in cloudflare and applied settings!
How is this possible? We did not change the DNS of the domain and it was connected to Cloudflare. Why should someone else be able to connect our domain to Cloudflare with their own settings?
my domain :

The site is proxied and so the IP addresses belong to Cloudlfare and do changeā€¦

Is the site content at yours?

The nameservers have changed since the site was registered a few days ago. The only way to take a site is to have access to your registrar to change the nameservers.

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