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BQ76952EVM: Abnormal cell balance

Part Number: BQ76952EVM
Other Parts Discussed in Thread: BQ76952

Hi team,

When I test the cell balance, I find an abnormal phenomenon.

I connected 16 cells with the BQ76952 and set adjacent two of these need to be balanced, the two have the similar voltages.

I set the Cell Balance interval: 20s, then start the cell balance. Adjacent cells cannot be balanced at the same time, so I think "cell1 is balanced for 20s and stop, then cell2 start to be balanced for 20s" is normal.

But i find sometimes cell1 is balanced for 20s and stop, then cell2 start to  be balanced for more than 20s, such as 40s or 60s and more...Is normal? Waveform shows as below, and I attach the log and gg.file to the attachment.

If is normal, can you explain the specific rule of how the balanced cell changes for me?

Thanks.

 cell.log5cell.gg.csv