It is possible that the address is coming from a form fill function on your computer and is filling it with something that has been entered in another form, in the past. If you signed in with your Sign In and password, and see your tax information, it is highly unlikely anyone could have entered an address into your secure account.
However, if you would like to check the Sign In activity in your TurboTax account, to be sure there is no irregular use:
· Click on Tax Home, near the top of the left menu
· Click on Intuit Account, near the bottom of the left menu
· This will take you to Account Settings
· Click on Security, on the left side
· Click on the blue View link, by Account Activity
This will show recent Sign In information.
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