You might be aware of the popular project, DWS. https://github.com/Nummer/Destroy-Windows-10-Spying/releases
I came across some port forwarding issues on my host machine and could not figure out why my ports were not forwarding, however, I did suspect DWS had something to do with it.
This will mess up your port forwarding on your VPN client. The fix is to either reset your firewall rules or just disable Windows Firewall or just don't run DWS at all.
DWS conflicts with AirVPN.
I hope this helps anyone!