It's likely the distance of the scanner from the film plane. Does it zoom out any?
Even if that's not it, it's almost always a reason based on physics. Something is X at a size, but can only be Y at another size -- yet two aspects are identical.
The same is true of bodies, lenses ... pretty much anything when it comes to optics, cameras or not.
I'd have to know more about the scanner. They vary quite a bit.
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