Correspondingly, we as a company reserve the right to cancel several identical bets and consider only the first one active as well as valid
We can't see if the same user posted those bets (username is hidden 100%) but even if it is same user he used different amount of coins for betting so that can't be considered as identical bets.
One thing I don't understand is why you deleted and edited his betting history without any explanation, and I guess only reason for him doing this split betting would be to bypass your maximum payout limit per bet.