"No items to show" when trying to fill a saved login in Safari

Sorry...my bad. https://www.tellicolife.org is the public-facing URL and TLD for this site, but the site is back-ended by Memberclicks, thus the https://tvlife.memberclicks.net, They're both the same site. But that said, I have https://tvlife.memberclicks.net/login as the website in 1Password, and if I use "Go & Fill" from within 1Password, it works fine. But if I go to https://www.tellicolife.org and click on Member Login, 1Password does not work...but is USED to work just fine.

I can eliminate the problem by going in the back door at https://tvlife.memberclicks.net/login, but I'm curious as to why it stopped working when using the Member Login at https://www.tellicolife.org. I suppose Memberclicks could have changed something behind the scenes.