Right, something is broken.
Here is the line, here is the code
$ rc("Ehehe. What is it? ♪", "Muhuhu♪ Did you need something?", "Nuu, what's up?", "Eh? What, what is it?", "Huhu, what is it?", "W-What? Did I do something wrong...?", "Aaah! U-um...wh-what...?",
"Waah!? D-don't startle me like that, jeez...", "Aah! D-don't scare me like that...")
The game doesn't know how to show a space?
It might be an unusual space of some kind, I searched for it and found 19 hits in whole interactions. But still, I don't think it's a rare japanese space for special cases.