Perfectly normal. Romance talks won't progress within dungeons, and for the most part, all of chapters 4 and 5 are just huge dungeons (the underdark included). Also, some of Jaheira's stuff requires you being outdoors, which you're obviously not in chapters 4/5.
Note, btw: all romances are disabled when you start chapter 7. If you want to finish it, DON'T START CHAPTER 7.
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