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It looks like a scam or probably a big fish for them to catch players in which they can easily to persuade to play on their side. They are fooling those people who are easy to get that's why as a gambler we should be aware on playing in a specific website in order for us to avoid scams like that.
If it is reputed gambling site means more whales are playing there and also their wager amount is lot bigger, probably they could involve in selective scamming on big bets but if they repeating them means no one will be playing their so how they are maintaining as one of the biggest casino. So I guess this is legit typo issue if if they uses the right hash calculator then it is probably can be verified its fairness.
Most gambling sites are always claiming to be the one of the biggest casino and even showing big bets that won and lose to attract gamblers to hop in their site. They're probably keep on maintaining scamming people and letting some gamblers win and let them lose once they became greedy which is one of the weakness or even sickness of gamblers.
It's probably a legit typo but that could damage the website a lot as it affect their probably fair rules. And a 5$ compensation for a crucial issue that can compromise their site is garbage.
I agree with you, I am really skeptic about this scenario here. When their reputation of legitimacy and being fair is at stake, even for a small mistake such as "typo" as they say, he compensation they made is not really justifying.