I used to have just one login displayed in my account settings. I only have one set of credentials for this account, but now I have two logins displayed in my settings.
I got logged out of my account (I don't think I did anything to log myself out, but I was multitasking, and I suck at multitasking) and now I have two logins, one called "Stack Exchange" and one listed as my email address and each login is showing the exact same timestamp to the second on "last used".
I think what was supposed to happen is that there would be one login and it would be listed as Stack Exchange but something went sideways? I use a gmail.com email, but I don't want to use my actual Google credentials. If it helps, I'm happy to change my email to something else.
I don't think it's anything on my end - I've tried multiple devices and browsers with the same result. I'm reluctant to try to "remove" one of them in case that puts me in a worse situation.