Guild Wars 2

Isn’t the game the game – or is there, somehow, a different build on different servers?
There are skill points, events, etc. that don’t work where I am, but will work if I change server (which I can’t do easily anymore since the 24hr cool-down was put into effect)

Actually, they are “broken” on all servers… just not always at the same time.

For example: skill-point-challenges are usually broken because

1. the NPC is dead: I’m not 100% sure but I guess this happens when a down-scaled Lv80 player kills the NPC at the wrong moment (for example: the NPC has 100 HP left, the Lv80 player hits him for 500HP → the NPC dies instead of resetting)
2. the NPC is gone: this could happen after 1. happens and the body is removed by the game OR simply because a player used a knockback-skill and hit the NPC right through a wall

So usually, all skill-points are working right after the servers were restarted until someone breaks them.

The quests seem to have a similar problem. Sometimes it happens that NPCs get stuck (this happens because they don’t only move on pre-defined paths but are free to leave those paths when mobs attack → you can see this while escorting some NPC – usually they follow a certain path – but when attacked they move around and when the fight is over they run back to where they have been before the fight started and continue their way from there). And because of this, NPCs can sometimes get stuck during battle when they are knocked back or if they go somewhere they shouldn’t have gone to

Or it happens that a mobs gets knocked back inside a rock or gets stuck in a tree, etc. where it can’t be killed.

So basically, its just bad luck if a lot of stuff is broken on server A while its working on server B because the bugs are there on both servers.