@leocg
Wasn't anything I could do to help in the list of saved passwords, or logging out from the account. Even deleting the account didn't seem to do the trick. Then I cleared/wiped my entire browser history, and after that, I got a blank log in for google instead, and was able to set up the correct account.
Thanks, though, because your suggestion made me play around with it more, until the problem was finally solved.

Opera always opens the wrong account for me. I have two, but one was for a job where I no longer work. How do I tell Opera to automatically open the correct account.