payment error 422: Unprocessable Entity

at some product when people want to order they get an error:

Error executing API call (422: Unprocessable Entity): The amount contains an invalid value. Field: amount.value. Documentation: https://docs.mollie.com/guides/handling-errors

It is not on all products, and my error logs does not give me more information.

First, wrong forum section.
Second, why asking here and not the mollie support?
Third: see https://github.com/mollie/OpenCart/issues/119