I've got a 2013 5-door hatch, all stock.
When I leave my driveway in the morning, I back out of my space and turn hard left. When I start going forward, after rolling a few feet, I hear a clunk from the rear of the car.
I'm assuming that maybe the rear diff "unlocks" when you back up and turn sharply, and then "locks" back up after rolling forward.
"locks" may not be the most correct word, but hope it gets the point across.
I'm not overly concerned, just wondering if it's a normal thing that others are aware of as well.