I have checked almost all scenarios from that table and all have the same result. And I trust my simulator more than I trust your math

You are the worst sort of idiot. You can't compute basic probability, but are so confident. I thought that anyone exploiting your site, would be obviously detecting (making thousand of bets at a high multiplier) but apparently even when you are told the bug you are too daft to comprehend it. He probably could've bled your bankroll dry and you wouldn't never realized.
As a community service, share the code of your simulator and I'll bug-fix it for you. It's quite obviously wrong
Look you idiot, tell me all parameters that he used and I will check.
But if you bet on payout 3968
And roll under 0.3
You don't make any profit at all in 100 million bets. But if I am missing a parameter that you didn't tell me then it's a different story.