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CreatedDate field changes on OpportunityHistory record

I have an integration that pulls OpportunityHistory records. About once a week, I see an OpportunityHistory record with the same Id that changes its CreatedDate value.

In other words, at some point in time we retrieve a OpportunityHistory record using the API. 5 minutes later we pull the same record (same Id value) and the CreatedDate has changed.

How can the CreatedDate of a record change after it is already written ?