On faction transfers

I enjoyed being a troll, I may even roll another one but as the majority of my toons and my guildmates are alliance, I faction switched my DK. Everything went fairly smoothly but I spotted something unusual today.
There are a chain of quests in Icecrown to unlock the shadow vault as a base of operations and open up a load of Ebon Blade daily quests. I had already done this on the horde to the point where I was wearing the Ebon Blade tabard and gaining rep in instances. After the faction transfer I didn’t give it much thought and carried on gaining rep right up to Exalted. So I figured I would head over and see if there was anything of value at the quartermaster (there wasn’t, not now enchants are BoA) but the shadow vault had reset back to it’s hostile version.
I headed over to the airship and found I could pick up the starter quest again, got everything unlocked again and now have two of what should be a one shot quest reward item. It’s not going to break the game mind you but it’s a curious turn of events. Free gold for me I guess in doing the quest chain twice but somewhat of an annoyance, even if it was mildly amusing.