The sim isn’t broken, it works exactly as designed. It sounds like you just don’t have a good grasp of how it works even after 13 years. “Lucky fans” have been a part of the game since BB began and it allows the GE to not implode and work properly from a tactic and play-by-play perspective. I’m all for realism in BB relating to real life basketball and sports, but it’s never going to line up exactly with real life because it is a game. If you would like to go to the suggestions forum, you are more than encouraged to propose a change.
Looking at your team history, you have spent 18 seasons in division V, 32 seasons in division IV, and have never made D.III in 13 years on BB. Complaining about lucky fans and a game outcome that you won by 45, should be the least of your concerns in my opinion, but you are welcome to disagree.