Ib data strange

It's very strange, after I backfilled data from IB, it looks alright:


however, it soon became as below:

All backfilled bars disappeared

BTW, even if I set backfill length as 5 days , it only backfill 2 days and then disappear.

oh please ignore the question.
It's my fault: I set 2 1000 bars at the database setting and disabled local storage.

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