This does not seem to be a browser specific problem. I have set up a login for greenmountaincoffee.com.
But when I try to enter the login information using the 1 Password link in my browsers only the password information is entered and the username text box remains empty.
In 1 Password app everything seems correctly entered. The username appears at the very top of the entry an also in a Field Name entry labelled "phmiddle_0$user_id"
Any ideas on how to fix this?