I've Synology Nas. I sometimes access it via "name:5001" on my local network. When that happens 1password isn't able to match any data and shows everything.
Additionally I've noticed that if you then try to search for the proper data, and click on that data it doesn't use the credentials but opens up different website (from the clicked credentials I guess). It's a bit counter intuitive if you ask me.
1Password Version: 6.8.473
Extension Version: 188.8.131.52
OS Version: Windows 10 1709
Sync Type: 1password