Read my previous posts here if you want background.

Okay guys, I'm so confused right now. For the past two weeks I've been working on cold approaches, connecting with people, and keeping a conversation going "naturally" as opposed to trying to follow some script in my head.

Initial encounters have been going pretty well, but then for some reason the next time I run into said girl it's like her attitude towards me shifted 180 degrees. Here's an example:

I ran into a girl I had worked with on a group project some time ago when I was heading home from class, and since we were both walking the same direction I figured it wouldn't hurt to strike up a conversation. So we started talking about the class and it was smooth sailing. She was smiling and laughing, I kept eye contact, the conversation was fun. We parted ways, I said good-bye and that was that. Fast-forward two days later. I run into her again during a break between classes and try talking to her again. Nothing crazy, just asking about her day, classes, etc etc. Her response was what I can only describe as a cold shoulder of liquid nitrogen. One word responses, and she barely looked my way the whole time.

And this isn't a one-time thing, it's happened on three or four separate occasions with the exact same results. What's going on here? I try to relax and let things happen as they come, but it's getting harder and harder with responses like that. Am I just broken? Maybe I pissed off a gypsy in a past life and this is my punishment, I dunno.