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By flash back, do you mean it's highlighting the text in that field? It should only show an "invalid email address" if the email address is not registering as a valid email, and not flash back - or show you an error after attempting to log in.
What might be happening is something is that some input is getting read from a keyboard, controller, or some other device that is switching between the fields like when you hit the tab key. If you have any controllers connected, try unplugging them.