IPFW Weird loopback traffic

I have IPFW with kernel NAT running (not quite finished yet).

I have 3 public IPs on a single interface with one ip natted. The natted IP is in front of a couple of nginx jails.

I am seeing some unusual traffic between the one of the public IPs and the natted public IP, the traffic is going over the loopback.

Code:
Aug 27 22:16:20 b5 kernel: ipfw: 302 Deny TCP 119.111.11.11:44321 119.11.11.12:443 out via lo0

What produces this traffic is me hitting one of the jails on port 443 from my laptop (external to the servers network). The traffic hits the server on 119.111.11.11 which then proxys the traffic to 119.111.11.12 (which is the natted IP).

Is there any normal reason for this traffic?
 
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