I am surprised that many people used this site and no one noticed the typo. It turns out that no one checked the hash or people somehow guessed what algorithm to use.
This is a very good lead and eye opener to all of us gamblers to check the veracity and validation of the information being posted by gamblers, this could many gambling network to lose credibility if they do not fix it, if it's a typo error then they should correct it and other gambling sites also should check if there are a typo errors, of course we don't want gambling sites we are playing and promoting losing their reputation
It turns out that most people trust gaming sites even if they have the ability to check whether the game is fair. Or are they just careless)
Ahahahahahahahaahah.
this is typical. I would say more - this is normal, for average people to not pay attention to such things. So, OP despite he is not so knowledgeable about sha256/sha512 (there is no need to use "heavy" 512, while we have strong and more easier sha256) he is enough attentive to check his seed.
I certainly wouldn't check the fairness of the game every time. However, I would check the validity of the final hash at least a couple of times.