This is a trend following ETF strategy.
@Pratik
If you check the positions in your algo (Backtester --> Activity --> Positions --> Load Positions)
You won't find any short positions.
In my backtest of your algo I just change the start date to 10/01/2008 and didn't find any long positions.
Check this two lines
if sma7 > sma21 and not context.shorting:
elif sma7 < sma21 and not context.go_long:
To my mind they should be like this
if sma7 > sma21 and not context.go_long:
elif sma7 < sma21 and not context.shorting:
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