Prosper Marketplace, one of the largest U.S. online-lending platforms, notified the majority of the investors that buy its loans that it had overstated their annual returns due to a system error, a spokeswoman said.

The error has been fixed, according to spokeswoman Sarah Cain. Some of the investors that were affected saw their annual returns fall in half, but in most cases returns fell less than 2 percentage points, Cain said. The issue has been going for “several quarters,” she said.

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