Port Forwarding Defaults to Random IP

While it is beyond me that cox has forced me to use this buggy and weird wifi.cox thing, here I am in this situation. I have an ethernet connected Desktop which needs to be portforwarded on several ports (the interface forces me to delete ALL ports to make a change, that **, but isn't my issue). I should have a reserved ip address lets just say on 192.168.my.ip (shown like this for security reasons), the update has forced it to a DHCP 192.168.my.ip, and every time I try to change it, it does nothing. Still not the main issue. When I go to port forward, it asks for the device, I click the device, fill in the info, and hey look, it changes to 192.168.0.2 instead of 192.168.my.ip, and says that there is no device on that, there isn't... Yet I check my device, and it is shown as being 192.168.my.ip. This has completely crippled all of the services on my computer, and me being annoyed is an understatement.