3.7V Li Battery Fuel Gauge not showing correct charging voltages

Hey, hope you all are fine.

there is an issue with an 3.7V Li Battery Fuel Gauge that when i remove a power supply from the connector it is giving me exact voltages of a battery and percentage but when i connect a power supply with the green connector for charging, its giving me more voltages than the actual voltage of a battery. i want an exact charging voltages and percentage.