I've downloaded Ninjatrader to backtest the strategy and test some other ones, but I'm not getting the expected results.\

A few things are happening here:

My results are long only, your backtest includes short trades
NinjaTrader does not compound returns unless specified. In other words, DefaultQuantity will always purchase 1 BTC regardless of account size. This skews overall account returns.
NinjaTrader does not graph mark-to-market PNL charts, only changes in closed PNL. This is why there are sudden surges upwards or downwards on your graphs
There is probably an error in the price data used - your results imply that a short trade lost 100% (market rose 100% while short) - I cannot see this in market history