Inconsistent minute bars for historical data api

Why am I getting different minute bars for historical data api?
It was AAPL,2022-06-02 11:35:00,149.48,149.48,149.48,149.48,1506 earlier when I saved it,
but now I’m getting AAPL:2022-06-02T11:35:00,149.48;149.49;149.48;149.49;1456 which is even less volume than before

NOW:
AAPL:2022-06-02T11:34:00,149.42;149.42;149.42;149.42;561
AAPL:2022-06-02T11:35:00,149.48;149.49;149.48;149.49;1456
AAPL:2022-06-02T11:36:00,149.49;149.54;149.49;149.5;4207

SAVED:
AAPL,2022-06-02 11:34:00,149.42,149.42,149.42,149.42,561
AAPL,2022-06-02 11:35:00,149.48,149.48,149.48,149.48,1506
AAPL,2022-06-02 11:36:00,149.49,149.49,149.49,149.49,4157

looks like 50 volume moved from 11:35:00 into 11:36:00