I also found something weird that might be the problem:
See here
https://gyazo.com/5a6c564135b986472bbc0fc628a497f4
I wrote sv_lan to check the value, and it said 0, but even though it was 0, it still said " - Server is a lan server ( no heartbeat, no authentication, no non-class C addresses )"
Could that be the problem? how do I fix it?
I have my ports set! why is it restricted only to me? (lan)