RE: charging problem
The battery management system can only estimate the charge of the battery. After a charge, the cells will 'rest' and the open circuit voltage comes down. When you open the door, the system is activated, recognises that the cells are not at their maximum charge, after this 'resting', and so goes to put a little more charge in to them.
It is within the normal behaviour of a battery like this, in these circumstances. Nothing to worry about.