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Which quick charger model do you have?
settings > about phone > build number
If you're on the latest build...
32.2.A.0.305 changes some battery charging settings.
[SETTINGS]>>System - About Phone>>Status>>Charging Optimisation>> On/Off
"Adjust the amount of charge to increase battery lifespan. This may shorten the usage time of your device."
EDIT: Whoops .. forgot to finish.
See if turning that on or off makes a difference to what you can see.