Okay, I followed up and here's what I found:
1) I'm seeing that navigating away from the page is erasing the reaction-dependent text, like you said. I think that's an error with how the incremental code runs (ie when you pick a reaction, it changes the variable $_reaction to either charismatic, compassionate, or irritable; this is then used to increment your player personality (giving you one point higher in one of the three personality types), and then erased so it isn't constantly changing even when you don't choose anything). In theory, it shouldn't be running on utility pages like the save dialogue: I'll need to have a look at what the hell is going on there, which might take a hot second.
Overall, I don't think you're seeing dialogue-dependent text when you navigate BACK to that page: you're just seeing the general text that appears regardless of what you choose, to rejoin the branching dialogue.
2) In the same vein as the last part of the other bug, Siruud will always mock you for not being able to kill him, even if you never even tried to. It's because he's a jerk, and assumes that your moral stance against killing him for no reason is a weakness, the same as he views your last minute refusal to go through with your attempt at violence as a weakness: weird guy! I'd like to hope it just read weird because you had a bumpy few passages 😅