Help with a possible bug in ep. 1

I've played the main game and both episodes multiple times without any issues, but recently I encountered a possible bug. If I move a bit far from her, Alyx starts saying voice lines such as “GORDON!”, “Where are you?”, and similar lines, even though it doesn’t make sense in the context.

For example, in the chapter “Urban Flight”, after placing the cars over the antlion holes and entering the building with the gas leak, she says something like “I'll cover outside while you figure this out” (I can't remember the exact line). However, shortly after that she starts saying the voice lines I mentioned earlier. It's kinda unsettling and it bothers me a little bit, but if there's no fix I can live with it.

Also, only experiencing this in Ep. 1
The main game works fine and I haven't replayed Ep. 2 to see if that happens too.