I found similar jumping several times, and I did a calibration by completely discharging the battery. During discharging, the last 1 percent is supper durable. However, after a couple of days, the jump reappear again.
your phone is guessing what your battery percentage is. if you want to fix it, drain phone down until it completely dies. then charge it to 100% without turning it back on. It will recalibrate your phone battery stats and you no longer will have the phone jump from 80-100% when charging.
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