Wiki states that order amount gets round while submitting: Order Amounts.

But for XAU/USD and XAG/USD instruments the order amount gets truncated:

Are the amounts ok from within the strategy?

What do you mean?

Hi, Support Team!

Do you confirm this bug?

What he or she is asking is for you to pull these values out of the Strategy Order objects in order to confirm as claimed (while only observing the Event log) that the underlying values in question have indeed been truncated. As it stands now, if there is an issue, it is not clear whether this is with the Order APIs/Server or whether it is the presentation code displaying the event log that is responsible for the discrepancies raised.

Wiki - Order Amounts:So, amounts have indeed been truncated, not rounded.

The issue has been registered

Additional info: submitOrder method does not round amount for any instrument (not only for metals).
To replicate this issue run the attached strategy in Historical Tester and look into the end of the generated report.

package jforex;

import com.dukascopy.api.*;
import java.util.EnumSet;

public class TestAmountRounding implements IStrategy {

    public void onStart(IContext context) throws JFException {
        if (context.getEngine().getType() == IEngine.Type.TEST) {
            context.setSubscribedInstruments(EnumSet.of(Instrument.EURUSD, Instrument.XAGUSD), true);
            context.getEngine().submitOrder("order1", Instrument.EURUSD, IEngine.OrderCommand.BUY, 0.00123456789);
            context.getEngine().submitOrder("order2", Instrument.XAGUSD, IEngine.OrderCommand.BUY, 0.000056789);
        }
        context.stop();
    }

    public void onTick(Instrument instrument, ITick tick) throws JFException {}
    public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {}
    public void onMessage(IMessage message) throws JFException {}
    public void onAccount(IAccount account) throws JFException {}
    public void onStop() throws JFException {}
}

Fixed with the JForex-API 2.9.12.