Port Forwarding not actually opening ports

I am trying to open some ports so I can run a game server, but the ports are still closed upon opening the server. I have tried literally everything. I have the ports opened on the xFi app, I tried enabling DMZ, disabled advanced security, manually opened ports on Windows via Firewall settings, and completely disabled the firewall. I even tried disconnecting my computer from the network, forgetting the device, and reconnecting it to get a brand new connection and port forward, but it's still not working. I have looked at endless forums to no avail, I can only assume at this point that its on my routers/Xfinity's end.

Currently trying to open the following ports:

• TCP: 21025-21026, 27015, 27036
• UDP: 27015, 27031-27036

It seems only ports 21025 and 27036 are not blocked, but the rest are.