The alignment of fingers in our hand
This is normal, and the effect is accentuated dramatically if you pretend to be holding an imaginary round object (somewhat smaller than a baseball, for instance.) The fingertips will all approximately point towards the very end of the thumb.



(See upper right image.) If the stone were smaller, the effect would be more visible.)

This orientation of the fingers makes the hand and fingers extremely versatile, being able to grasp and manipulate objects of a wide variety of shapes.

It also allows fine manipulation of thumb and fingers. Touching each fingertip to the tip of the thumb quickly shows the same effect - the fingertips approximately align with the thumb. If they didn't align this way, we would lose some of our very fine (as in requiring great precision, not as in quality) motor skills.

I'm not going to hypothesize on why the hand evolved the way it did; it's very efficient and that seems reason enough.