All players IPs being logged as router IP

I'm not sure how to fix this one, networking isn't my area.

Basically, all players are being logged as logging in with the IP of my router, 192.168.0.1. This is a problem when it comes to grief or compromised accounts.

Anyone know why it might be doing this?

Here's the network structure:

First:
Actiontec V1000h ISP Provided Router/Modem acting as a transparent bridge, thus NAT is disabled. It's basically invisible.
Then:
Netgear WNDR3700 Router set up with DHCP, it has the public IP set by my ISP.
Then:
D-Link Gigabit switch (should also basically be invisible):
Then:
Minecraft Server

 

Are you using a Proxy ip? My server did that when I was on a proxy for a bit.

 

As far as I know, I'm not using any proxy-anythings