I had 4x lucky on an item that was +1. I figured yay, let's put it up to +3. It failed like twice but I finally got it up to +3. I used lucky powder every single time and I can't figure out why exactly the lucky stat went down some times and didn't other times. Does it only not go down when it fails? (I wasn't really paying attention, maybe that's it

) or does it only go down when the random number generated is in the extra luck margin. Like if it has 2 in 10 odds of working normally and 3 in 10 with the lucky stat, it only goes down when the random number generated is a 3? With ppl paying so much for lucky stones, I wanna know how exactly it works.