When I go to inbox.google.com and try to log into my personal email account it always instead logs me into my work email account. Only when I enter the correct password for my work email account though, even though it shows that I’m logging into my personal account. If I enter the correct password for my personal account it will not log me in. It seems like some strangeness with saved form data and hidden fields is happening. This only occurs in Brave so far as I know. I have signed in with Chrome without issue.
What operating system are you on?
macOs Sierra version 10.12.3
This issue with default password manager is captured here and should have a fix soon. You can track it here