My iPhone 11 Pro Max battery health is increasing

I don’t know why that is, but you should be happy. :)

try to recalibrate the battery. And also, restart the device. Hold down the sleep/wake button until a menu pops up. Follow the instructions listed on the screen, then wait a few seconds for it I finish shutting down. Then turn it back on.

The re calibration has been completed and now you are getting the accurate reading of your battery health. Isn't that a good thing? :)

If your battery health increases, that is good.