I always feel like Im hurting my bag when I snap it! It should have been magnetic.
^I had that problem too with a black caviar flap. Luckily I noticed it soon enough and sort of massaged it out... It happens when you press against the bag, so when I carry my flaps, I make sure not to have my arm resting against it. Anyway it's on the inside and no one knows about it but you, so I wouldn't worry too much about it. From far the crease is hardly noticeable for me, when the bag is opened.