I just changed servers on GuildWars 2 from "Anvil Rock" (US) to "Ruins of Surnia" (EU) because Anvil Rock is full, and I have 5 friends that recently bought the game.
Even though I know that they could eventually be able to join the "full" server by simply trying periodically, that would be a lot, so I decided to migrate to a non full server.
As I am an achievement hunter, I decided to try with my "newbie" friends, the Wayfarer Foothills Jumping Puzzle, which I've had done before with the character I was logged in. After finishing the puzzle, there was a chest, but none of my two friends had their achievements (I wouldn't anyway since I had it already).
Later on that same day, I've found a pair of Diving Goggles on Metrica Province, but after putting them on and jumping of the Waterfall, there was no achievement message, so I kept trying it from different spots but nothing happened.
After a quick research I've found another Diving spot on Metrica Province, so I went for there, and there was no Goggles where they should be.
It may be a coincidence since I haven't tried any other challenge so far, but three out of three haven't worked in different forms.
Tech / Developer Perspective:
@Derp: Believe me, I'm a developer, so I know what bad code may cause :] The thing is that, depending on their replication logic, theoretically, every server should point to the same "Image" of the game, launching it and so, leading to the same "game code" running on every server. Also, fixing a single point of code, should fix the bug in every server. That's why I am asking, is it possible that they are not using the same "code" for all servers ?
Thanks in advance