Maplestory Myths - know any?

Go to any mob that drops any equip with 4+ different lines of stats, and try to get an item that's a copy of the first. obviously there is the chance of people getting the same item twice of course it is really low, but when the only occurrence of this, is when people gach so fast you see the XXX gained item from gach at the same second, there is obviously some flaw in nexon's rng and it is exploitable.