data issue with um btcusdt futures booktickers historical data

We notice that for a lot of the files under here: Binance Data Collection

The bookticker data is out of order in those dates, where the data points supposedly showing up at the end of the file showing up in the beginning every other row. What could be the issue? Is all the data valid?

Hi, all the files are valid. Please let us know if you found any issue.