I want to hear if anybody else is experiencing this funny behaviour: When I want to login into AGOL from ArcMap 10.6.1 (this was also the case in older versions) and I misspell for example my user name, when I want to delete a character it always deletes two at the same time. I would say this is a bug but I couldn't find anybody else complaining about it. Attached a small video showing the behaviour.
(I am not sure if ArcGIS Online is the right place but it was the best fit...)