I've linked 2 password entries to the URL maxdev (a local dns that I use for development).
When I use the browser extension context menu to fill in the password, I always get the password for entry that is highest up in the password list.
I suspect that it takes the first match for the linked URL, instead of checking further down in the list for the correct match.
Both entries below (Portal NO and Portal SE) are linked to url http://maxdev.
Whichever option I choose in the browser extension context menu, I always get the credentials connected to Portal NO.