You could try draining it to zero and recharging it without using it. Sometimes the battery life calibration gets a little off and reports bad numbers. There's not a perfect way to monitor battery health a lot of it is based on the voltage curve of the battery and that's somewhat variable from battery to battery in a way that can mess with the battery health estimate.
There's also the chance you get a slightly bad battery and just got screwed on the lottery.
There's also the chance you get a slightly bad battery and just got screwed on the lottery.