Why do the columns of the Temple of Hera show different styles?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

The columns of the Temple of Hera at Olympia exhibit a great variety of styles because they were originally constructed of wood and were gradually replaced with stone over time.1

As the temple underwent repairs and renovations across different periods, the wooden columns were replaced individually, leading to a mix of styles that reflected the evolving architectural practices of the eras in which the replacements occurred. This process was so gradual that as late as the 2nd century CE, one original wooden column still remained in the opisthodomos (rear porch) of the structure.1