I use 3 minute candle sticks for US stocks with IB. I noticed the NT charts are not 100% the same as the ones in IB during real time trading. I have to right click on a chart and then click "reload all historical data", then their charts become in sync. After a little while, they are out of sync again. I thought it might be IB's data. So I switched to Kinetick. It is the same.
This poses a big problem because my back testing is done on historical data. If real time bar painting on the screen is different than historical, then my back testing is useless.
Is this a bug or am I doing something wrong here?
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