The cell voltages displayed are completely bogus. (However, the overall pack voltage looks sane)
5.8 volts from a LiPo cell is impossible. You can't get a cell to this voltage - it'll explode/burninate long before that. Similarly, if a cell actually did drop below the undervoltage protection (usually somewhere in the 2.7-3.0 volt range), the whole pack would get isolated.
Who knows what the cell voltages really are, but if the BMS is reporting bogosity like that, I wouldn't fly that battery again. There's a good chance that the cells are in reality reasonably balanced now but the same thing causing the cell voltages to get misreported may cause the balance to go WAY out of wack in only 1-2 charge cycles.