Mitsubishi Outlander PHEV 2019 - strange SOC-jump at each charging cycle

[tm-107]

Hello, I own a 2019 Outlander PHEV.
Does anyone know why the raw state of charge (SOC) data in PID 2101/B4 jumps from 169 to 196 during each charging cycle? My calculated SOC slowly rises to 71.79%, then jumps directly to 89.10%, and then continues to rise slowly to 100%. At this point, the charging power drops to 200–300 W for a few minutes. I suspect that cell balancing is being performed at this moment. However, this doesn't make sense with an SOC of around 80%.
thx

btw: I use "(B4-58)/1.56)" to calculate the state of charge, since my motor starts at a raw value in B4 of <60 and the charging process ends at 213.