Great that you found the causes of the bugs! To be honest, I didn’t even think that different timelines could somehow be related to this. It also turns out that the way the petal gain system works is pretty much how I imagined it, though it's a bit embarrassing that I didn't immediately realize that petals are added as float numbers. That makes perfect sense, considering the increased petal acquisition speed in college after clearing the save.
By the way, I'm curious. How do you plan to solve the petal issue? Will you try to link the mechanics of obtaining buyable petals to the sex mechanics? Or maybe you’ll try duplicating, renaming, and splitting the audio file that the main character and NPCs play during sex? Or maybe you came up with some other solution to the problem?