I believe most of the things you are referring to are triggered by actions and/or dialog, some of which are tied to certain quests. So the simple answer would be: you have played the game differently and done certain things in a different order than you did the last time you played, and that's why certain people and places behave differently.
My advice? If you really want everything to happen *exactly* the way did it the last time you played, find a walkthrough and research what the requirements (in terms of actions/dialog) for these situations are. Another option could be to just play the game organically and go with the flow, and embrace the versatility between different playthroughs.
I hope this helps -- English is obviously not your native language, so some things might get lost in translation.
Thank you for your courtesy and understandable English)).
I play the role "good elf-fighter" in this game.
I installed the original game from GOG, plus the hotfix package from the official site,
plus an improved map of the world, plus "The Darkest Day".
My group - cleric Viconia, mage Kzar, Montaron thief,
and rescued Imoen,after Spellhold.
What I want to say about broken quests?
1. Kzar and Montaron in the Docks.
This quest ,with the resurrection of both of them - worked, but it did not work,
when I was playing just to "clear"game version from GOG.
I took in my group Kzar and Montaron, and we passed the whole game from the beginning, and went out together from the Underdark,
but for all time from them was not a replics of the story, and side quests.
2. Shar-Teel in prison.
I rescued Shar-Teel from prison, but any additional quests she did not give.
3. After exiting Underdark, Elkhan not imposed spell on the Viconia, it's the same crash the game.
This is a mandatory part of the storyline.
Clearly, Viconia will not be allowed into the holy temple of Suldanasar, because she is "damned evil drow".
Therefore, on the subject, elf Elkhan imposes on Viconia a spell of death, that she could not harm to land elves by her evil actions.
When I go to the area of the cemetery,Bodhi was to steal the Viconia.I later learned, that Viconia become a vampire.
Then,in the battle with vampires and Bodhi, I wound Viconia in the underground complex at the cemetery.
Then I delivered her half alive body in the ruins of a Amunator temple, near the Umar,and put in the sacred font in the church.
And Viconia revived again, cured of her vampirism.
In the end - I mean the storyline relationship with Viconia.
I just played the whole storyline, and again I see, that this part of the game is not there.
What will advise in this sHituation?