[Edited to reflect that the issue is with the Chrome extension. The Firefox extension works fine.]
1. I go to a login page.
2. I manually check the "remember me" box.
3. I use the 1Password Chrome extension to select the login.
4. The extension fills in my user name and password, then unchecks the "remember me" box and submits.
When I use Firefox (add-on version 4.6.3), it leaves the "remember me" box checked. (I've just tested with Agilebits login page and the Dropbox login page.)
I've noticed this over the past few days, but I don't know how long it has been broken.
1Password Version: 6.5.5
Extension Version: 18.104.22.168 (Chrome)
OS Version: Mac OS 10.11.6
Sync Type: Not Provided