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There is nothing mysterious about this if you simply assume the electron aligns with the measurement direction.

It does this because it necessarily interacts with the measurement apparatus, which in this case is an anisotropic magnetic field!

“Things rotate when they are rotated! News at eleven!”

The vast majority of quantum mechanics has easily explained with ordinary wave mechanics.

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They should all align to the same direction though.

I think the equivalent one with photons is better. They say it's a quantum paradox that if you put a polarization filter between two others it can increase the total transmittance. But actually, classical electrodynamics explains that just fine.

> They should all align to the same direction though.

With the measurement direction, yes, but the other axes are not constrained, and hence measurement along those directions returns unpredictable values.

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