I think there needs to be a warning in the guild menu section stating that upgrades to the guild are for the server they were started/completed on and that they do not transfer.
Found this out the hard way during head start, when I changed servers to be with some friends who didn’t get the head start. Sucks to lose so much influence points and upgrades due to something I had no idea would happen and isn’t stated telling you this anywhere in game/before transferring.