asking the office DNS the same question i get 51.38.69.52, asking 9.9.9.9 it gives me the same IP as the office DNS. Finaly asking google or 8.8.8.8 i also get 51.38.69.52
So i think their record is borked.
Nobody cares; the reality is if you use CF DNS, shit don't work.
From what I understand, it's the opposite: Cloudflare doesn't use a relatively new feature of DNS (EDNS Client Subnet), and that site doesn't like the lack of that feature.