I am trying to calculate returns by assets in my backtest using backtest json file.

In Statistics json field there are main backtests statistics. Net profit is 1877%

Now, I want to calculate returns by assets, In my case, I have only 2 assets (SPY and TLT).

I tried to use TotalPerformance > ClosedTrades json field. There are entry and exit prices in columns of that field.

I have tried to calculate total returns of every closed trade (Exit price / Entry price - 1 per closed trade), but total return is lower than net profit in Statistics, around 1300%.

Why I don't get same profit in those two cases?