Parameter-values-are-unexpected-and-identical

I am sure I am doing something wrong but:

CODE:
using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Data;
using WealthLab.Indicators;
using System.Collections.Generic;

namespace WealthScript1 
{
    public class MyStrategy : UserStrategyBase
    {

      public MyStrategy() // This has to have the name of the class above
      {
   
         // In this instance I am not using this for anything
         AddParameter("Period 1", ParameterType.Int32, 18, 3, 30, 1);   // Parameter index 0
         AddParameter("MAX_ROC_int", ParameterType.Int32, 4, 3, 20, 1);   // Parameter index 1
      }   


      //create indicators and other objects here, this is executed prior to the main trading loop
      public override void Initialize(BarHistory bars)
        {
         StartIndex = 100;
         BarHistory yh_TLT = GetHistory(bars,"TLT","Yahoo_ETF");
         xday_rocs = ROC.Series(yh_TLT.Close,Parameters[0].AsInt);


         PlotIndicatorLine(xday_rocs, WLColor.Red);
         
        }

When I originally programmed this I set period for xday_rocs to 26. Now when I graph xday_rocs the period always appears as 26 despite me having optimized to a different period. How do I correct that.



My defaults are set to 18 and 4

Thank you.