Incorrect IP Address Deducted by Nginx version: nginx/1.2.1

[B.R.]

Despite what you are stating, I see a valid NZ IP address in the
'$_SERVER'​ environment variables of the PHP instance running behind Nginx
(most probably 210.55.x.x prefix).

The Apache remote address is not the right one.

Since you failed to explain your setup, I suppose Nginx proxies traffic to
Apache.
That would explain the REMOTE_ADDR is the one from the gateway.
Your proxy configuration fails to pass the original visitor IP address
through the HTTP_X_FORWARDED_FOR field.
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*B. R.*
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