Could be that 1 in 3 papers are hired works from “paper mills” that fabricate data and plagiarize from elsewhere:

Journals are awash in a rising tide of scientific manuscripts from paper mills—secretive businesses that allow researchers to pad their publication records by paying for fake papers or undeserved authorship.

Source: Fake scientific papers are alarmingly common | Science | AAAS

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Coldstreams Skeptic