I cannot find where this changed. Doing old content and running normal. Changed to heroic, and it shows all bosses defeated. Tried to reset and it still shows defeated. When did this change? Currently running dragon soul.
IIRC, this is just for WotLK and Cata raids. Not sure if it extends to MoP too. It’s been a while for me.
You can only clear one version p/week. Not sure why, but it’s been like that for a long time.
Cata raids used the boss kill lockout system where you can only kill each raid boss once per week regardless of the difficulty level. Once you’ve killed a particular raid boss, you’re not allowed to enter an instance where that boss is still alive. This was used for Wrath, Cata, and most MoP raids (except SoO).
They combined them for the sake of Timewalking, iirc. I don’t really understand the purpose behind it, but all the gear drops from one difficulty. Same with Ulduar. It definitely means that tmog is harder to get because the loot tables are so bloated.
I know they merged all the different version of Ulduar, but I don’t think they did that across the board. This support post describes the current state of raid lockouts:
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