Somebody elses email address was in the sign in box when i clicked back?

I was in my email then clicked back and somebody elses email address was int he sign in box that i just signed into with my name????

Somebody elses email address was in the sign in box when i clicked back?
The computer may have been holding on to an older 'cache' file that had that information. Just click F5 (refresh) and it should vanish and then you can type in your info.

college