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As-salamu 'alaikum wa rahmatu Allahi wa barakatuh

I was wondering about the grammar in Ayah 41:37

﴿وَمِنْ ءَايَـتِهِ الَّيْلُ وَالنَّهَارُ وَالشَّمْسُ وَالْقَمَرُ لاَ تَسْجُدُواْ لِلشَّمْسِ وَلاَ لِلْقَمَرِ وَاسْجُدُواْ لِلَّهِ الَّذِى خَلَقَهُنَّ إِن كُنتُمْ إِيَّاهُ تَعْبُدُونَ

Why is the word "khlaqahunna" used when it talks about the Sun and the Moon when the Moon is male in grammatical gender?

Jazakumu Allahu khairan