New
#1
That said, it's a bug. See: Balloon Notification displayed at upper left corner
As suggested, if you enable the balloon through GPO, set it back to the default and use the Registry edit to bring the balloon on. See: Enable balloon notifications in Windows 10 using a Registry tweak
I tried both ways, registry and GPO. reboot and still the same.
Can't find any answer to this. Maybe, need to wait for a bug fix... sorry.