I haven't played long, but this has happened with three lines of banter from my PCs: One of my characters will say something in a generic voice that sounds like it's trapped in a well (quite tinny with a strong, short reverb). For example, I just stole something in Cyceal and my female PC said something to the effect of, "Oh, I didn't know you were so edgy. The girls in the academy will like that," in the voice of a man trapped in a well.
What the hell?
Honestly, the voiceovers have broken immersion for me so many times in my short time playing that I've now muted them entirely, but I'm curious as to what's happening here regardless.