Make sure you are in the daily time frame while viewing the performance and trade history to ensure you have the most historical data as possible from Trading View.
Finally, due to the way Trading View enters trades at the end of a candle, you must subtract one day from your starting and your end dates.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.