I noticed the same thing. It's may be because the reflection was so much closer to me than the peaks themselves. I was so lucky that it wasn't windy that evening and the surface of the tarn was like glass.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)