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BQ76PL455EVM: UNDER VOLTAGE FAULT when all battery cells are already balanced

Part Number: BQ76PL455EVM

Hello

I just finished the set up of the evaluation board and the battery pack (16 cells) . A soon as I start the "polling", the board signal a COMP UV error for cell 1, 11, 15 and 16. All cells are equally charged and placed in series in the pack. I cannot understand how it can be possible to have COMP UV, even when using a tester on the cells involved they show to be perfectly balanced with the rest of them.

Could someone please suggest how to trouble shoot this issue? I looked through the Q&A without succes.

Thank you