Yes, it's on purpose. The nose skins, being U-shaped, are like a spring -- wanting to pull apart at the edges. By placing a slight bend on those edges it will help them lay flat against the underlying top and bottoms skins after riveting. Otherwise there's a tendency for the nose skins to sit "proud" of the other skins creating a gap. Not the end of the world, but not aesthetically pleasing. The trailing edges of the top and bottom skins being flat don't have the same issue.
Todd “I drink and know things” Stovall
RV-10 N728TT - Flying!