Heya,
So I'm on my first playthrough and a few days ago I started Act 2 after helping the Druids and refugees in Act 1.
Got to Last Light Inn and, as you might expect, got quite surprised by what followed. I rejected Marcus and his proposal to help him kidnap Isobel. Started the fight, tried to heal and save her while fighting enemies, but ultimately failed and Marcus flied away with her, while I was left to deal with the consequences. Long story short, everyone died, from Harpers to refugees I helped in Act 1, including Dammon, Roland, Alfira, Bracus - hell, even Jaheira died during the fight.
My heart sunk, and I couldn't continue playing for a couple of days, contemplating loading an earlier save to try again. But in the end I accepted the consequences and continued playing (only to lose Halsin as well, after he instructed me to guard the portal to Shadowfell, as if losing Last Light Inn wasn't enough).
Fast forward some hours, and I get to Moonrise Towers, where Ketheric for some reason thanks me for helping them get Isobel, and Z'rell as well, saying I got Isobel before she even asked me to do it.
Is this some kind of bug, or am I missing something? It's very annoying to accept horrifying consequences of my actions and choices, only for the game to - hours later - not acknowledge what I actually did, while saying I did the opposite.