What's the Reason for Hebrew's Mixed-Up Genders?

Quite a few masculine and feminine Hebrew words, when pluralized, take the form of the opposite gender. Why?

From “Angelus Novus” by Paul Klee, 1920.

From “Angelus Novus” by Paul Klee, 1920.

observation
April 28 2021
About Philologos

Philologos, the renowned Jewish-language columnist, appears twice a month in Mosaic. Questions for him may be sent to his email address by clicking here.

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More about: Arts & Culture, Gender, Hebrew, History & Ideas, Language