Just logged on to do Lich King 25H, using one of my toons 11/12 lockouts. I had the toon invite the one I wanted to do LK on into the group, turned to 25 heroic and went into the raid. I was greeted with a 12/12 lockout with nothing alive in the instance. The only way this changed, was if I changed it to 25 normal and had my lockout toon inside the raid first. I tried changing it to heroic inside, which said it worked, however, LK still had 31m HP. He's meant to have 50ish on 25H.
Anyone know if this is a bug, or if I've done something stupid?