ModifyPosition(buyposition, 10000) faulty

Hi,

When Modifying volume  by reducing it from say 20000 to 10000 (by half) it works perfectly. but when you reduce it by more or less than half it fails to make sence.

If 0.4 lot has a net profit of say 40$,

closing 0.2 lot should be 40$/2=20$ which works

closing 0.1 lot should be 40$/4=10$ but give wrong. also closing 0.3 lot is wrong etc

I expect  closing

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class NewcBot : Robot
    {
        public int i = 1;

        protected override void OnStart()
        {
            ExecuteMarketOrder(TradeType.Buy, Symbol, 40000, "x");
        }

        protected override void OnTick()
        {
            var buyposition = Positions.Find("x", Symbol, TradeType.Buy);
            if (buyposition.Pips > 20 && i < 2)
            {
                Print(buyposition.NetProfit + "   this is 0.4 Lot = 100%");
                ModifyPosition(buyposition, 10000);
                Print(buyposition.NetProfit + "  This  0.1 Lot & should be 25%");
                i += 1;
            }
        }
    }
}

Thank you