503 error from cloudflare

We are in the process of bringing up a new web server.

We have just moved an existing zone from one Cloudflare account to a new one.

At one point we had duplicate DNS records in our zone settings for a host. One of the records had an invalid IP. We have now reduced this to a single IP (in the last hour or so).

Our website now appears to be working correctly however every now and then we are seeing a 503.

<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body bgcolor="white">
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>cloudflare-nginx</center>
</body>
</html>

Here is the trace against the site.

fl=47f38
h=beta.onepub.dev
ip=159.196.216.23
ts=1653521652.702
visit_scheme=https
uag=Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36
colo=MEL
http=http/3
loc=AU
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off

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