ScreenSaver Timout Lock asking for both username and password

[H2Os]

I have just setup 10 on a domain system, after letting the system screensaver lock turn on, when attempting to unlock the system it is asking for both the domain userid and password. The first time I thought it may have restarted while I was away, but that was not the case. The screen comes up to the other user login. Looking into my settings now but users hate SS Locks to begin with, this would only make it worse.