Mistakes can't be avoided since we are humans and we are not perfect but we can always recheck our bets to make sure we are doing the correct thing. I guess you realized you made a mistake after you have submitted it so, this should be your lesson that in the future make sure to double check everything because dice is a gamble one mistake can either make or break you.
There are times that winning gives us something addicting, and that is profits or money, it is like we are stoned that is why we can't control what we are doing even if we are aware of the situation, but we can't undo it once we lost our profits already, it is a wake up call for our addiction in gambling, to tell us that winning or losing is not the point in gambling, the point is for us to realize that gambling is not for everyone.
I know that gambling is a way to earn easy money and we can't help but to feel jealous to those people who makes a large amount of money on it, but we have different skills, it is up to us to know what it is and use that to earn huge amount of money also.