Chart text dissapears quickly after backtesting

Hey, this is the code i"m using for a cBot to display accelerator indicator values on the chart.  Whenever I run the bot in backtesting it shows all the data points but then they all dissapear.   Any clue how I'm doing this wrong??

All the code is inside OnBar()

            var lastOsci1 =_acceleratorOscillator.Result.Last(1);
            var barHighValue = Bars.Last(1).High;
            Chart.DrawText($"{lastOsci1}" + $".{barHighValue}", $"{lastOsci1}", Bars.Last(1).OpenTime, barHighValue, Color.Red);