Stop loss does not always trigger when using GenerateStopLoss() during backtest

Using the code below triggers a short entry at 170.23 on 08-04-2020 and places a 40 tick stop or exit on close. This code was tested on contract DBM20 from CQG.

using System;
using System.Drawing;
using System.Linq;
using PowerLanguage.Function;
using ATCenterProxy.interop;

namespace PowerLanguage.Strategy
{
    public class SL : SignalObject
    {
        private IOrderPriced sellToEnter;

        public SL(object _ctx):base(_ctx)
        {
        }

        protected override void Create()
        {
            this.sellToEnter = OrderCreator.Stop(
                new SOrderParameters(Contracts.Default, "EnterShort", EOrderAction.SellShort));
        }

        protected override void CalcBar()
        {
            this.sellToEnter.Send(170.23);  

            this.GenerateExitOnClose();
            this.GenerateStopLossPt(40);
        }
    }
}

If this signal is placed on a daily chart, the signal takes a one tick winner on the close.

However, if this signal is placed on a 60 minute chart, the trade hits the stop loss. Hitting the stop loss is correct as the stop price does trade.