No currency and wrong values when using OfflineConversionFeedReturnValue

[Jose Luis Lopez Pino]

We are using OfflineConversionFeedReturnValue because conversions don't happen on our website.

We are uploading click specifying the currency EUR.

An example:

{

            'googleClickId': 'CjwKCAiAyrXiBRAjEiwATI95mSSp7ZXFrlSfFGWwL_MCzp6hQaiFu6A3_fC6TB5BPJELriIBnMkQDBoCxFwQAvD_BwE',

            'conversionName': 'Sale',

            'conversionTime': '20190313 024219 Europe/Berlin',

            'conversionValue': 8.46,

            'conversionCurrencyCode': 'EUR',

            'externalAttributionCredit': None,

            'externalAttributionModel': None

        }

However, when we check the conversions uploaded to AdWords no currency is shown and the values look definitely too high, maybe about 5 times higher than we expect it to be: https://i.imgur.com/cgen6MW.png

Our account is configured in EUR.

Am I missing something important about using this API?