I have a membership, which should (according to https://support.1password.com/sync-options/) sync across all my devices continously. I have a specific login that is failing to update on my iPhone after I've changed it on my PC. Whether or not other logins are failing is beyond my knowledge.
1Password Version: 7.3.684
Extension Version: Not Provided
OS Version: Windows 10 Pro 64-Bit Build 17134
Sync Type: Membership