Wifi Privacy - how private?

Hi, just installed Wifi Privacy for the first time on a Windows 10 laptop, re-booted and connected. Now I did a port check on the reputable grc.com. I am connected over 4G and via wifi hotspot. The port test shows that not all of my ports are stealthed, ports 78 and 443 wide open. Is this normal? Am I secure? With Wifi Privacy off, all my ports are stealthed over the 4G / Wifi connection, protected by Norton Security.

By the way, VPN security is not my strong topic, really need to understand whether I am better protected against potential hacking with Wifi Privacy turned on but these ports open, or stealthed with Wifi Privacy disabled.

Thanks.