This may be not a problem but it should be a functionalityfeature of your energy manager or power manager driver. I am using Lenovo laptop and in this the new power manager driver have the feature that you can put a battery into conservation mode that protect battery to charge above 60% (in lenovo limit is 60%) after that it shows plugged in but not charging. This is feature is useful when you want to continuously use laptop without worrying about charging of battery. And itI also notedobserved that this functionfeature still remain even if you change osOS, shutwdownshutdown and than charge it. The only way to turn off the conservation mode is to off from the same software again. soSo check your laptops powermanagerpower manager driver may be you can find this type of functioanlityfeature with the name conservation mode or any other name and turn it off.
Edit:
In my Lenovo Laptop I've Found the way to turn off the feature which I've mentioned above. The trick is very simple. I shut down the computer and remove the battery and long press the power button without any power source (around 40 second).