If configuring external DNS, this is the IP address you would see configured. However, since you’ve configured Netlify DNS, the requests will be routed to the nearest CDN node to the user making the request. This means the IP address will vary depending on location. You can see those varying addresses by location looking up the domain here:
Additionally, we go into more detail about how this routing works in this support guide here:
TLDR; the domain is correctly configured and working as expected.