It is possible that your browser is caching old data and is showing you something that is not really there. First try clearing your cache.
If you have changed your router, it is possible the way to get into the settings page has changed. To find out how either look in the instruction manual, look at the label on the modem, or (with your PC is connected to the modem) open a command prompt and type in
Look for an entry called "Default Gateway". This will be the IP address to get into your router settings.
Good luck. Please let me know how you get on.