See (obfuscated for privacy) GIF at http://cl.ly/8461c8a4a7da with 1Password X.
Whenever I attempt logging in to https://zgcloud.zeitgroup.com/, it prompts me twice with the MacOS' system dialog to upload images.
When I hit "cancel", it prompts the dialog again, then I hit "cancel" again and I'm finally able to log in as expected.
I tried several times deleting and re-adding the login in 1password: same behaviour.
This happens only with this specific website.
1Password Version: Not Provided
Extension Version: 1.16.0
OS Version: OS X 10.14.5 (18F132)
Sync Type: Not Provided