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Why does praseodymium possess electronic...

Why does praseodymium possess electronic configuration `4f^(3)6s^(2)` instead of the expected one, `4f^(2)5d^(1)6s^(2)` ?

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According to Aufbau principle, 4f orbital is filled up by the electrons before the 5d orbital. Thus the electronic configuration of praseodymium is `4f^(3)6s^(2)` and not `4f^(2)5d^(1)6s^(2)`.
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