Random spaced out sign in notifications

bugwhat

It's pretty likely that you're receiving new device alerts because of Apple's new iCloud Private Relay, available in iOS 15 and higher, as well as macOS Monterey and higher. iCloud Private Relay will hide your IP address from sites and services that try to use it to track you. As it happens, your IP address is one of the identifying pieces of information that 1Password uses to determine which device or web browser you're using, hence the alerts.

These alerts can happen when you access 1Password on the web, but more commonly, they can also be sent by 1Password's new Web Extension, also introduced for iOS 15. That extension works in the background, and so alerts may seem to come in at "random."

That's the most likely situation here. I've seen it myself from time to time.