Are you using the spacebar to move to the next piece of dialogue? The spacebar in this game skips the entire scene rather than progressing forward to the next dialogue line. What you've described sounds like that's what's happening, but I can't be sure. If you're using Space, try LMB instead. That's the best way to continue the conversation step by step.
Yeah, sorry. My coding isn't even remotely good enough to make a mod, so a PDF walkthrough is the best I'm gonna be able to do for you. I barely had time to do this latest update to the PDF.