I experience this on many sites. Sometimes the auto logon works. At other times instead of logging on, a screen with the user id and password comes up, and to log on I have to intervene and hit enter. Then it logs in ok. I don't find a pattern to it. acts like a timing issue. Is there a timing parameter?
This is on mac os version 10.12.5 and also previous 10.12 versions.
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided