RSI indicator, Multiple timeframes, incorrect calculations

Good day, I use the following bot, on EST+2, and if I back test EURGBP on 3 July 2023 to 3 July 2023 on a 15 minute timeframe. On 7:15 for example the readings for LastValue & Last(1) is the same. (There is actually much more times when they are the same). Why is this the same?

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

namespace cAlgo
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class SampleRSIcBot : Robot
    {
        [Parameter("Quantity (Lots)", Group = "Volume", DefaultValue = 1, MinValue = 0.01, Step = 0.01)]
        public double Quantity { get; set; }

        [Parameter("RSI Periods", Group = "RSI", DefaultValue = 14)]
        public int RsiPeriods { get; set; }

        private RelativeStrengthIndex rsi1Hour;
        private RelativeStrengthIndex rsi15Min;

        protected override void OnStart()
        {
            Bars bars15m = MarketData.GetBars(TimeFrame.Minute15);
            Bars bars1h = MarketData.GetBars(TimeFrame.Hour);

            rsi1Hour = Indicators.RelativeStrengthIndex(bars1h.ClosePrices, RsiPeriods);
            rsi15Min = Indicators.RelativeStrengthIndex(bars15m.ClosePrices, RsiPeriods);
        }
        
         protected override void OnBar()
        {
         Print(" rsi15Min.Result.LastValue ", rsi15Min.Result.LastValue);
         Print(" rsi15Min.Result.Last(1) ",  rsi15Min.Result.Last(1));
        
        
        }       

        protected override void OnTick()
        {
            if (rsi1Hour.Result.LastValue < 30 && rsi15Min.Result.LastValue < 30)
            {
                Close(TradeType.Sell);
                Open(TradeType.Buy);
            }
            else if (rsi1Hour.Result.LastValue > 70 && rsi15Min.Result.LastValue > 70)
            {
                Close(TradeType.Buy);
                Open(TradeType.Sell);
            }
        }

        private void Close(TradeType tradeType)
        {
            foreach (var position in Positions.FindAll("SampleRSI", SymbolName, tradeType))
                ClosePosition(position);
        }

        private void Open(TradeType tradeType)
        {
            var position = Positions.Find("SampleRSI", SymbolName, tradeType);
            var volumeInUnits = Symbol.QuantityToVolumeInUnits(Quantity);

            if (position == null)
                ExecuteMarketOrder(tradeType, SymbolName, volumeInUnits, "SampleRSI");
        }
    }
}