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.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe