Every time I update historical data (1 minute) using IB backfill there
will be new bar in my chart (which it should be), but unexpectedly it
will also get rid of some of the oldest bars.

I expect IB backfill will add new bars without deleting any previous
historical data.I don't know whether it is because of my setting or it
is how AB works.
Any explanation on this will be appreciated, thanks.






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