This happens on the new universal login page in Edge or IE11: When the username/password inputs are empty and you start to type, the placeholder does not disappear (or float away to the top). Only when you leave the input field, the placeholder floats to the top. This gives our users the feeling …

It seems that there were also a few other customers having problems with that. There is no public ETA on that but I just got informed that the team will work on the fix soon.