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Alphalens flat April - Sept 2018

Can someone please explain? I've ran the pipeline in backtest and there is no inactive period. Am I interpreting the notebook correctly? In fact, using that pipeline in backtest over same period shows during the same April - Sept timeframe positions spiked from 34 to to 280 positions. Definitely not inactive!

Attaching notebook results and backtest screenshot
https://i.postimg.cc/nVqPmXYr/Screen-Shot-2020-05-24-at-7-22-33-PM.png
Thanks