Unexpected plot advance in Chapter 2

Hey everybody!

I have come here specifically to ask about one thing that ruined the my whole experience with the game, part 1 for now.

So, I got to Vizima, got out of prison, met Raymond and advanced in the investigation quite a bit. The dialogue lines did go a bit weird but I just let it slip until one weird turn.

It was like this: I got the Salamandra prisoner body from the gravedigger, read the book on autopsy and performed one on the body. And I found out that the prisoner had been poisoned which pointed to Kalkstein. Not without joy, I set out to his house so as to grab the bastard by his balls (I kind of dislike him for the condescending attitude). But instead of dialogue lines like "You asshole killer, mind explain why you did that?" I got something like "I almost believed you worked for Salamandra" and, even weirder, "Now I surely know Raymond is the leader of Salamandra".

To say the latter puzzled me would be an understatement. What the actual fuck in the world? I never found out anything that would have even remotely pointed to Raymond being Azar Javed in disguise, neither did I find any proof of Kalkstein being innocent. I did consult a walkthrough after that confusion and found out I had to go investigate the cemetery to find Raymond's dead body, but I never got any cues so as to do that in the game.

Could anyone explain to me what I might have done wrong with the game? I had truly enjoyed it until that incident, and the fact that I adore quests and detective stories makes it even worse for me. Thanks to everyone in advance!