Occasionally I get Google notifications that are meant for someone else - eg "New sign-in from iPad".

Say my email address is fredsmith@gmail.com, the email address in the body of this email is smithjones23@gmail.com. However the "to" that the email actually gets sent to is my fredsmith email. This seems like a bug with Google. Anyone else had this?

I did see a link at the bottom of the email that says "disconnect your email address from this account" and did that, but no idea how it got connected to start with.