[nanochip]

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It seems that before I choose what amount I want to bet, a randaom OSD is displayed ( 93%, 35%, etc )

Why ?

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The program has a feature to "preset" the bet amount with an amount that you can choose on the Street Bet tab. If you don't want to "preset" the bet, you can uncheck the option. However, you may find this to be a handy feature where the program will "preset" the bet amount to the amount you usually bet in those situations.