It sounds like you may need to adjust the charging settings on your charger to ensure that it is suitable for a 6s 22.2V LiPo battery. Make sure that your charger is designed to charge this type of battery and that it is set to the correct charging mode for the battery.
To charge a 6s 22.2V LiPo battery, your charger should be set to charge at a voltage of 22.2V and a current appropriate for the battery's capacity. It is also important to balance the battery during charging to ensure that each cell is charged evenly.
If you are still having trouble after adjusting the charging settings, I would recommend consulting the manual for your charger and battery to ensure that you are following the correct charging procedures.