I signed up for 1password 7 on my iMac, then converted the app on 2 iPads and 2 iPhones from iPassword 6. I'm syncing through Dropbox. I changed the password on one of my logins to test the syncing. At first the new ones showed up on only one iPhone, but today (24 hours later), all four mobile devices have the new login, BUT they all have two of each login. In the case of the one I changed, one login is the old password and the other the new. Also, I had changed my master password on the iMac when I signed up, but I had to manually change it on the 4 mobile devices.
1Password Version: 7.3.2
Extension Version: Not Provided
OS Version: OS 10.14.6, iOS 13.1.2
Sync Type: Dropbox