Why darmstadtium has more than one eletronic configuration? (Aufbau Principle)

Darmstadtium aparently has two possible eletronic configuration

via Aufbau Principle:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹ 5f¹⁴ 6d⁹

but for some reason at times I see it distributed as:

[Rn] 7s² 5f¹⁴ 6d⁸

I know that the only way to properly tell what is Darmstadtium eletronic configutarion is via experimental measurements, but why does it have two completely different distributions?