I have daily data in a csv file and all is working well.

I used the following code to resample it to weekly data:

data_resampled = cerebro.resampledata(
    dataname=data,
    timeframe=bt.TimeFrame.Weeks,
    compression=1)

But I have noticed that there is now a 1 bar delay between 'Buy Create' and 'Buy Executed'. This was not happening on the daily data prior to adding the resampling.

e.g. Weekly (resampled):
2012-10-19, BUY CREATE, 3.00
2012-11-02, BUY EXECUTED, Size: 10, Price: 2.93, Cost: 29.30, Comm 0.00

So it has skipped the 2012-10-26 bar altogether and entered at the opening price of the next bar.

This is happening on all buy signals.

Why would this be occurring?