Strange effects on a GF with Xist

Ok, so I use Xist almost every week with a certain girl, but it has the weirdest effect on her. We often watch movies and TV together, and when she's sitting next to me I can always tell when it hits her, because she starts doing this weird twitchy thing. She'll turn her head sharply look at me for a split second, and then snap her head back forward again,and again,and again. You get the idea. It's really weird and I wonder what's going through her head when she's doing this. I don't want to tell her to stop, even though it's insanely annoying. I guess she's really into me. It was really over the top this weekend when I used Xist with Glace(which is an amazing combo BTW). Anybody ever see weird responses to Xist?

I used 1 spray Xist, 2 sprays Glace. Target is Asian