After edited a user and save, we have to deselect the user we just finished before selecting another user. It should be a default action to deselect after exiting the edit mode. It will be even better to have the display of the users at the same place instead of going back to the top of the list.
Yes! It would be less of a problem is the list opened to where the user is selected, then you could deselect quickly as needed.
It can be useful to leave items selected, I'd say make it a system setting which can be switched on/off.
This applies to other list as well. Once we edit an item and come back to the list, it should deselect the item we just edited/viewed.