I can't do the last round of Gonggi

I got myself a cheap gonggi replica from Amazon and can now after some practice comfortably do all the rounds except the last one. Are actual gonggis supposed to be bouncy or is it just mine? They won't land on the upper side of my hand because they will just bounce off and land elsewhere. Even if I try it with one single stone. Am I just bad at it still or is it the gonggi?