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If this happens more often that bets are canceled, this is definitely a reason for Roobet to ask more specifically why the cancellations happen. This must also have a provable reason on the part of the service provider, he can not simply cancel bets on his own initiative, where he would have to pay out.
Yes, Roobet must ask the provider why there is a voided bet, and that has also been explained by Roobet the reason for the voided bet and I believe what Roobet said is an explanation from the provider that there is an incorrect display of odds, it's all in the screenshot included by the maker of this accusation, and I think he should accept this.