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What is wrong with Quantopian Backtest?

My strategy start at 2015-01-05, but in the Transaction Details, I buy the "BABA" from 2015-01-06. Why I did not buy the "BABA" at 2015-01-05. My strategy start at 2015-01-05.

Clone Algorithm
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Backtest from to with initial capital
Total Returns
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Alpha
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Beta
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Sharpe
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Sortino
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Max Drawdown
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Benchmark Returns
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Volatility
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Returns 1 Month 3 Month 6 Month 12 Month
Alpha 1 Month 3 Month 6 Month 12 Month
Beta 1 Month 3 Month 6 Month 12 Month
Sharpe 1 Month 3 Month 6 Month 12 Month
Sortino 1 Month 3 Month 6 Month 12 Month
Volatility 1 Month 3 Month 6 Month 12 Month
Max Drawdown 1 Month 3 Month 6 Month 12 Month
# Backtest ID: 555603f376fecf0c69a6ef25
There was a runtime error.
1 response

Because you're running in daily mode. In daily mode, the algorithm executes sometime overnight (Midnight GMT I thinkā€¦ my backtest buys tend to execute around 8pm EST in daily mode). If you run in minutely mode, it will execute right at market open on your starting day.