Do you know what directly creates spin? (Hint: grooves don't create spin).
Friction creates spin. So when your face looks the one above, that means that the grass,
moisture, dirt, and other debris have nowhere to go but in-between the ball and the face of your wedge. The ball will typically end up making an impact high on the face -- you should see a grass, dirt, or wet spot there. Try it out for yourself!
You might be practicing during the day, when it's drier or around your club chipping green that only has "fairway" or '1st cut' lies -- you won't really see what happens until playing your round and that chip that was so easy on the chipping green turns into a long putt save for your up and down.
