Quality limits outside of home network



I am having some issues streaming outside my network at full quality. For some reason, I am limited to 328p at 720kbps. In the remote access section of the settings, it says that "Your server is signed in to Plex, but is not reachable from outside your network." HOWEVER, I can stream successfully outside of my network. It's just with most plex apps, I can't stream at original quality. With the android app however, I can stream at original quality. I don't really understand what the issue could be.