When they flaked a spall off the core material the flake was curved. Instead of tossing it they utilized it into a point, and sometimes they fashioned it into a knife. I have found several quite similar. Sometimes you wonder if it would have flown straight. They could have also utilized it as a halfted knife.
Asymmetrical sides usually is from one edge having been sharpened more, which usually is indicating use as a knife. The curve is just from the way the material came off.