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>The factors that orchestrate their coordinated movements is still a mystery.

I'd propose that the path of the sun biases the mice's movements in the same direction, since the ice in their shadows will be colder.

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But then they would move in the same general direction every day, if it was that easy it would have already been solved.

No, just over time.

They tracked the balls for two months, if it was easy to see that they always move X direction during a sunny day they would know. That is likely the first thing they checked, we know that plants can turn to face the sun.

Because the terrain is never perfectly uniform, the pattern might not be evident within a small period of time, like one day.

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