The number one reason is GPU driver issues. Different users have different graphics cards, and those graphics cards have very complex drivers that interface between the game and the graphics hardware. The differences between those drivers can mean that bugs appear for one user with one set of drivers but not another. The drivers themselves can sometimes be where the actual bug is; it’s just that this one game happened to replicated the conditions where it appears.
That’s why one of the first things that they tell you when a game is having technical issues is to update your drivers, so that you can at least rule out that it’s an issue connected to outdated drivers.
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